A CHILLING THRILLER FROM THE SUNDAY TIMES BESTSELLING AUTHOR OF INTERNATIONAL PHENOMENON, THE WHISPER MAN'I read it in almost one sitting...an outstanding read' Luca Veste---When young police office Mark Nelson is assigned to Detective John Mackey's team, he's thrilled to work with a legend of the force.Following the death of his girlfriend years before, Mark has thrown himself into his work, determined to be the best. And if there's anyone who can help him get there, it's Mackey. No one has cracked more cases.But there's one case that he's never managed to solve - The 50/50 Killer. A man who preys on copules, taking them hostage before forcing them to play a twisted game. He asks them to make a simple choice. Who should live? And who will die? When a tortured young man stumbles into the police station one morning, he reveals to Mark that he's barely escaped The 50/50 Killer with his life - but his girlfriend is still in danger.Has the victim's escape sealed his girlfriend's fate? Or can Mark and Mackey put a stop to the killer's spree, once and for all? ---Praise for Alex North'The best crime novel of the decade' Steve Cavanagh'A thriller that is both terrifying and utterly heartbreaking. Mesmerising and masterful' Mark Billingham'This is a true skin-crawler' Guardian'Shades of Thomas Harris and Stephen King but brilliant in its own right' C.J. Tudor'First it's spooky. Then it's scary. Then it's terrifying' A.J. Finn