The new high-concept, high-octane thriller from the author of An Ethical Guide to Murder.

The world is ending, but that's not what this story is about.

Nat's a scientist, determined to be in control of her own destiny. Not so easy when her twin, Raya, can predict the future. As Nat's on the cusp of academic success, Raya announces the end is nigh - in exactly five years to the day - leaving Nat to pick up the pieces of her estranged and spiralling family.

As word gets out, people turn to Raya for answers, camping out in the grounds of the family summer house. But Nat knows that real answers come from a textbook. As the group becomes volatile, she uses research-backed and increasingly coercive tactics to keep the peace, enjoying leadership more than she likes to admit. But is it really a doomsday cult when the world actually is ending? And it's not murder when everyone's going to die anyway, right?

As the end gets closer and the world outside the summer house becomes more chaotic, Nat's control over the group is tested. Then they start asking questions she doesn't have the answers to: How should they prepare? How should they spend their limited time left? What really matters at the end?

And is Raya telling the truth?