He's already murdered eight women. Now, he's coming for me.

We find her on a grey November day on Dartmoor, England.

I'm excavating a Bronze-Age cairn, expecting to find a burial urn and maybe some bronze tools if I'm really lucky. And then I see her fingers poking through the soil as if she's trying to claw her way out of her grave. I'm an osteoarchaeologist, used to dealing with bones, and I know immediately she's been in the ground for months rather than thousands of years.

Then I find a message in the grave that's clearly meant for me.

It turns out the girl is the eighth victim of a serial killer, and now I'm convinced that the murderer knows me. It's making me look at everyone in a different light - colleagues, family, and friends. My life is disintegrating around me, and I want to run. But if I do, I know I'll never stop. It's time to make a stand.