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Darren O'Sullivan
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Win or Die: A BRAND NEW gripping and breathtaking psychological thriller Kindle Edition

by DARREN O'SULLIVAN (Author) Format: Kindle Edition
4.3 out of 5 stars 117 ratings
‘Pulsing with tension, it’s a non-stop adrenaline rush from start to finish. High stakes action and relentless twists.’ — from multi-million copy bestselling author JOHN MARRS

Cassie will do anything to save her brother. But how far can she go before it kills her?

Cassie’s world is falling apart. Since their parents died, Cassie and Sam have had only each other. But now Sam is in deep trouble — He has one week to come up with nineteen thousand pounds or he won’t survive.

Cassie’s options are running out. The only way to make that kind of money fast? DareMe — a game where users complete dares for cash. It sounds insane, but it's her only shot.

The dares start easy but, soon, they escalate. The stakes grow higher. And the danger? More real than she ever could have imagined.

As the clock ticks down, Cassie discovers she’s not just playing for money — she’s playing for her life.

How much can she endure before the game breaks her — and the people she loves?

A heart-pounding, breathless thriller that will keep you on the edge of your seat, from the bestselling author of The Husband. Perfect for fans of John Marrs, Freida McFadden, and the film Nerve.

Readers are LOVING WIN OR DIE:

⭐⭐⭐⭐⭐ ‘I finished this last night and COULD NOT PUT IT DOWN! Holy cow, what a banger this is!’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘This is officially my favourite thriller. It was like Jeanne Ryan‘s novel, Nerve, but with a lot more going on.’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘Wow, wow, WOW!!! I read this book like the bogeyman was after me. It was like I was in a high-octane, GTA-style race, speeding through chapters . . . I was literally on the edge of my seat the entire time. What a RUSH!’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘Definitely don’t want to miss this, a must read for everyone. You won’t regret it.’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘Jam packed with everything you want from a thriller, twists surprises and emotions. The author’s writing style is always gripping and this is so well done.’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘An excellent read for any and all readers! Author comes at you with both barrels and knocks you out of your shoes! . . . I give this book FIVE stars! Definitely recommend!’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘I cannot put into words how absolutely fabulous this book is . . . a complete page turner!!!!’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘If you only read one book this year, make it this one!’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘Has to be among the top 5 books I have read this year. A solid 5/5 stars from me.’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘I bet I could’ve won a speed reading contest this book was so so good.’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘There are definitely aspects of this novel that are reminiscent of something that John Marrs may have produced. However, it would be doing the author a great disservice to suggest that “Win or Die” is merely a facsimile of a Marrs story — it certainly isn’t.’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘Oh my gosh, I literally was up all night reading this. It was so worth the lack of sleep! . . . I wish I could go back and force myself to slow down, re-read and savour every moment. I loved it!’ NetGalley Reviewer

⭐⭐⭐⭐⭐ ‘Has to be among the top 5 books I have read this year. A solid 5/5 stars from me.’ NetGalley Reviewer
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  1. Print length
    331 pages
  2. Language
    English
  3. Publication date
    April 16, 2025
  4. File size
    1.4 MB
  5. Page Flip
    Enabled
  6. Word Wise
    Enabled
  7. Enhanced typesetting
    Enabled
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Unwell Hydration from Alex Cooper
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From the Publisher

social media thriller, high-stakes dares, deadly online game, sibling loyalty, desperate for money,

ife-or-death choices, protecting family, tech-driven thriller, gripping and intense, fast-paced

danger, Black Mirror vibes, Squid Game fans, moral boundaries tested, race against time

teenage desperation, urban thriller, digital-age paranoia, dark twisty plot, obsession and risk,

psychological suspense, modern survival game, adrenaline-fueled challenges, viral internet craze,

unputdownable crime drama, John Marrs, Blake Crouch, Squid Gam, Black Mirror

Fredia McFadden, booktok, thrillers, bookstall

crime fiction

The Night They Stole My Baby
The Husband
Win or Die
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Customer Reviews
4.3 out of 5 stars 2,152
4.2 out of 5 stars 4,809
4.3 out of 5 stars 117
Price $3.99 $3.99 $3.99
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Paperback ✓ ✓ ✓

Editorial Reviews

About the Author

Darren O'Sullivan is a bestselling author, screen writer and award-nominated theatre director. His books have sold over 150,000 copies and been translated into German and Polish and sold into America, Canada and Australia. Two of his novels were selected for the prestigious Karin Slaughter Bookclub. Darren has also contributed a short story, The Big Burn Bookclub, to EVERYDAY KINDNESS, a 2021 up-lit anthology with proceeds going to Shelter. Darren also writes under a pseudonym, B.B. Thomas. B.B'.s first book The Rain published in 2021 exclusively for Audible and was an editor's choice. His first novel, Our Little Secret, is optioned by Rollick Film, and he is credited as the writer/director of the feature film. --This text refers to the paperback edition.

Product details

  • ASIN ‏ : ‎ B0F1Y436KS
  • Publisher ‏ : ‎ Joffe Books psychological thrillers, suspense and crime (April 16, 2025)
  • Publication date ‏ : ‎ April 16, 2025
  • Language ‏ : ‎ English
  • File size ‏ : ‎ 1.4 MB
  • Simultaneous device usage ‏ : ‎ Unlimited
  • Text-to-Speech ‏ : ‎ Enabled
  • Screen Reader ‏ : ‎ Supported
  • Enhanced typesetting ‏ : ‎ Enabled
  • X-Ray ‏ : ‎ Not Enabled
  • Word Wise ‏ : ‎ Enabled
  • Print length ‏ : ‎ 331 pages
  • Customer Reviews:
    4.3 out of 5 stars 117 ratings

About the author

Follow authors to get new release updates, plus improved recommendations.
Darren O'Sullivan

Darren O'Sullivan

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Full content visible, double tap to read brief content.

Darren O’Sullivan is a bestselling author, screen writer and award nominated theatre director.

His books have sold over 150,000 copies and been translated into German and Polish and sold into America, Canada and Australia. Two of his novels were selected for the prestigious Karin Slaughter Bookclub.

His new thriller THE HUSBAND was be published by Joffe Books in NOV 2024.

His Next for Joffe, DAREME is published 16th April 2025

Darren has also contributed a short story ‘The Big Burn Bookclub’ to EVERYDAY KINDNESS, a 2021 up-lit anthology with proceeds going to Shelter.

Darren also writes under a pseudonym, BB Thomas and DB Stephens. BB’s first book THE RAIN was published in 2021 exclusively for Audible and was an editors choice.

DB Stephen's book, THE SERIAL KILLER SUPPORT GROUP is the first in a new serial killer series, The Secret Vigilante, is due for publication May 8th 2025 with HarperCollins imprint, One More Chapter.

His first novel, Our Little Secret, is optioned by Rollick Film, and he is credited as the writer of the feature film.

His 8 thrillers can be read in any order.

OUR LITTLE SECRET (July 2017)

CLOSE YOUR EYES (May 2018)

CLOSER THAN YOU THINK (March 2019)

DARK CORNERS (April 2020)

THE PLAYERS (May 2021)

THE PRICE (JUNE 2023)

THE NIGHT THEY STOLE MY BABY (May 2024)

THE HUSBAND (Nov 2024)

You can follow Darren on:

X @Darrensully,

Instagram @darrensully,

Facebook @darrenosullivanauthor

Customer reviews

4.3 out of 5 stars
117 global ratings

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Top reviews from the United States

  • Gidget
    5.0 out of 5 stars Great book
    Reviewed in the United States on May 4, 2025
    Verified Purchase
    This was a book I stumbled on and am so glad I did. I love it. Hope there is a second on soon!
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  • Sinsandscares
    4.0 out of 5 stars Dark and Twisty Thriller
    Reviewed in the United States on May 1, 2025
    Rating: ⭐️⭐️⭐️⭐️

    It took me a little bit to get into this one, but once it clicked, I could not put it down.

    As the oldest sister myself, I found Cassie so relatable. The way she felt responsible for her brother, even for his mistakes, really hit home. The slower start gives you the background you need to understand her choices, and from there it just takes off.

    The whole idea of DareMe, a social app where people do increasingly risky dares for money, felt way too believable. I love speculative fiction that feels a little too close to real life, and this definitely delivered. The tension builds fast, and the multiple POVs added a lot to the story.

    And finding out Darren O’Sullivan is friends with John Marrs? Makes total sense. If you love Marrs’ books, this will be right up your alley.

    The ending didn’t totally match the flow of the rest of the book, which threw me off a little… but that final page? I NEED a book two!

    Highly recommend if you’re into dark, fast-paced thrillers with a tech twist and morally messy characters.

    Thank you to NetGalley and Joffe Books for the eARC. All opinions are my own.
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  • Ashley Campbell
    5.0 out of 5 stars Taut and gripping crime thriller!!
    Reviewed in the United States on April 17, 2025
    Win or Die by Darren O'Sullivan is a taut and gripping crime thriller that will have readers on the edge of their seats!

    Cassie and her younger brother Sam have been by themselves since their mother died when Cassie was 19 and Sam was 10. Cassie has always tried her best to provide for Sam, often missing out on her own life so Sam was taken care of. Now ten years later Sam has found himself in trouble with some very bad people. When Cassie finds Sam bound and beaten, Sam finally tells her that he owes these men 19,000 pounds. With Sam in the hospital recovering from operations from the attack, Cassie knows it is up to her to pay her brother's debt. Cassie signs up on a social media game app called DareMe where players can earn money by accepting and completing dares and filming themselves doing them. After completing a couple of easy ones (kiss a stranger, swim across a river, run down the street in your underwear etc) but only making a couple hundred pounds, Cassie needs to start doing the higher paying dares. Unfortunately some of these dares are illegal or worse. With the clock ticking down on when she needs to pay the people Sam owes, another dare is set and this time Cassie might not survive.

    This was such a fast-paced and enjoyable book! The plot is unique and interesting and I really enjoyed diving into the dark side of social media and what people will do for fame or money. The whole mob effect towards the end was very well written, I could feel myself growing more paranoid and tense as time progressed. The twists are definitely well placed and absolutely believable especially in the social media driven world we are in today. One of O'Sullivan's strongest attributes in this book is his masterful character development. Seeing Cassie's vulnerability and love for her brother is just heart-wrenching. And don't even get me started on that ending.. absolutely wild!

    Thank you to NetGalley, Darren O'Sullivan, and Joffe Books for this ARC! Publication date is April 16th 2025.
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  • Sherry R
    5.0 out of 5 stars best thriller I've read this year
    Reviewed in the United States on April 22, 2025
    Can someone tell me why this book hasn’t gone viral yet?!?!? Seriously this is probably the best thriller I’ve read this year. Yes, there were a couple of moments where I thought did it really just go there, but it really is that good. I did not want to put it down. From start to finish I was invested in the plot and in Cassie. There were moments that made me gasp out loud. How often can you say that? I have a pretty decent track record of not being shocked, because I usually guess everything and everyone. But there were things I did not see coming.

    It’s a unique premise in a genre that seems a lot of the time to be recycling plotlines. Tinkering with them to try for something different. This is fresh and stands out in the genre of domestic plots. Ultimately it is about a family. A sister trying to protect her brother, but it focused on more than that.

    It’s pulse pounding and adrenaline filled. While I never thought about it during the read, it does have a little bit of a message about social media and has great opportunities for book club discussions. How far would you go to protect a loved one and does social media bring out the best or the worst in us.

    There were a few moments later in the book that reminded me a little of The Purge and a play on a short lived US TV series that focused on crowd sourcing crimes.

    I really can’t recommend this book enough. I flipping loved it and wish I could read it for the first time again. And based on that ending, maybe I can? I’d be all in to see where it would head if there was a sequel.
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  • Grantsbrarian
    5.0 out of 5 stars Taut, suspenseful race-against-the-clock
    Reviewed in the United States on May 9, 2025
    Cassie and Sam only have each other after their parents die. They are just scraping by on Cassie's salary, but when she finds out Sam has gotten involved with some shady characters and owes them a boat ton of money. A lot more than she can raise even if she cashes out her savings.

    Then she finds out about an online social media app called Dare Me, where players can accept dares for cash. Did I mention there are also time limits? Participants are anonymous, because they wear disguises and their details are supposedly protected by the app. But after a few successful dares, Cassie is taking on riskier and riskier dares, and becoming infamous on the app. And with fame, comes...stalkers.

    What would you do for money, if it meant saving your kid brother?

    This was a taut, suspenseful, race-against-the-clock book. If you like shows like Black Mirror or Squid Games, this book is a must-read!
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  • Faith Skewlow
    3.0 out of 5 stars Not what I expected
    Reviewed in the United States on April 26, 2025
    Thought it was a mystery of who dunnit! It was a dare type book of video gamers! Not my type usual read. It seemed to jump around a lot .
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Top reviews from other countries

  • Alhema
    5.0 out of 5 stars Gripping.
    Reviewed in the United Kingdom on May 4, 2025
    Verified Purchase
    When I started reading this book, I was open minded about the story. I thought the concept of daring members of the public to act in an irresponsible way for money could be over-the-top. But upon reflection, there have been TV shows in the past like ‘Married at first sight,’ Where strangers marry after being matched. The show produced very few happy marriages; the success rate was around 15%. And I can talk from experience about marrying a stranger, my wife and I met at work one afternoon and were engaged by going home time, marrying four months later. In spite of dire predictions from well-meaning people. We were successful because we done it for love, and not for TV show glitter and a cash incentive. There was a TV show called ‘I Wanna Marry Harry.’ A group of American ladies vying for the attention of an obviously fake Prince Harry, and making fools of themselves. Another TV show was ‘Naked Attraction.’ Where contestants bare-all in the pursuit of a date. So perhaps the stories plot is not so far fetched after all. In the story a young man is a courier for a gang boss and while smuggling a package through customs, has to dispose of it quickly as it became obvious, he was caught in a trap, and if caught with the package would blow the illegal operation sky-high. Is the gang boss grateful for the young man’s resourcefulness, saving the operation? Even though admitting that the courier done the right thing, he has the young man beaten up and demands a seriously amount of cash as recompense for the lost package. As a child in the 1930s, I saw a Popeye cartoon called “Leave Well Enough Alone.” Where a parrot advises Popeye not to meddle in things and Popeye quickly learns the wisdom of that advice. All my life that cartoon has stuck in my mind, I always leave well enough alone. The gang boss’s spiteful action has unforeseen reactions leading to mayhem, murder and escalates as things become out of control. I’m not saying any more about the story, except that I’m enjoying it. The cartoon I refer to, is available on line.
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  • The Larl Bookworm
    5.0 out of 5 stars Amazing book!
    Reviewed in the United Kingdom on April 17, 2025
    Verified Purchase
    OK... I'm still stat here thinking... wow... where do I even start with Win Or Die?

     

    The story follows Cassie and her brother Sam and what happens when £19,000 is owed to some very dodgy people by Sam.

     

    So how can Cassie collect £19k inside a week to save her brother? Well, by joining in the new social media craze DareMe. Things get dark and twisty very fast...

     

    This book has some serious 'Nerve' vibes (2016 movie) but is incredibly realistic in its approach. I also love that film so it was a given I'd love this book too.

     

    Cassie and Sam are great characters and I loved how Darren portrayed Cassie. I immediately empathised with her!

     

    The whole concept of this book is exploring the depravity of social media and of course, just how low will someone go for cash...

     

    I started reading this and didn't quite know what to expect as it initially starts off as a calm before the storm kind of thriller but when the adrenaline kicks in, boy does it kick in and I became hooked until I finished!

     

    And... I DIDN'T GUESS THE BAD GUYS! This (to me) is the sign of an outstanding crime thriller as normally I can work out a bag guy really on in the book!

     

    This is the first time I've read Darren but based on this book alone, I will definitely read Darren's work again as this was incredible!
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  • debbie
    5.0 out of 5 stars Great Read
    Reviewed in the United Kingdom on May 2, 2025
    Verified Purchase
    I was hooked on this book from the first couple pages i couldn’t put it down the plot is good and different to what i normally read so many twists and turns Cassie will go to the ends of the earth for her brother . I’ve read Darren’s book before and they never disappoint Another fantastic read
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  • Toby Aslam Mohammed
    5.0 out of 5 stars Interesting
    Reviewed in the United Kingdom on May 11, 2025
    Verified Purchase
    Really enjoyed this book. The characters were believable the story was gripping. What happened with the app was quite believable.
    Ending I think could have been better rather than taking you into potentially something similar.
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  • Kelly Tilley
    5.0 out of 5 stars Hooked from start to end
    Reviewed in the United Kingdom on April 27, 2025
    Verified Purchase
    Absolutely brilliant book! I was genuinely hooked from the beginning, and I felt anxious and on edge throughout as it was so believable. You could literally imagine a world where this happens! Highly recommend. Could not put down.
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