You're waiting up for your son. Then you spot him: he's with someone. And - you can't believe what you see - your funny, happy teenage boy stabs this stranger. You don't know who.

You don't know why. You only know your son is charged with murder. His future is lost.

That night you fall asleep in despair. But when you wake . .. it is yesterday. The day before the murder. Somewhere in the past lie the answers - a reason for this crime. And your only chance to stop it . .

'Masterfully plotted and ingenious. One of the best books I've read this year' SUNDAY EXPRESS

'Perfection, every word, every moment. One of the best books I've ever read' LISA JEWELL

'Wow. Amazing! Loved every page .. . If you are looking for a summer read, I've found it!' HOLLY WILLOUGHBY

THE SUNDAY TIMES THRILLER OF THE YEAR