When their father dies unexpectedly, siblings Max, Ellie and Nathan can’t even contemplate emptying his house—not least because he spent his last decade curating what feels like a museum to his polished public image. So it is Max’s wife, Caroline, who finds the suitcase under a bed… A suitcase stuffed full of an awful lot of cash.

The source of the money is a mystery to them all, and each has a strong opinion about what to do with it. Ellie and her husband James have an expensive lifestyle to maintain and could do with their share of the windfall—James in particular, for reasons he doesn’t dare reveal. Nathan can’t be trusted with money, as the others all know; he’s desperate to get his hands on some (or all) of the cash. But Caroline is the one guarding the suitcase, and she’s insisting to Max that they take it to the police.

The three siblings have always been close. But now, with this money from nowhere threatening to rewrite what they thought they knew about their father and their family, nothing seems certain. Could it really tear them apart?