By the time they come face to face, the 50/50 Killer knows his victims all too well. After weeks of surveillance, he targets young couples and subjects them to a single night of hellish torture and manipulation, testing and destroying the love between them. Ultimately, he puts the choice in their hands - only one will be allowed to survive past dawn - and they must decide... Mark Nelson is a young police officer, newly assigned to the team of John Mercer - a legend in the force. It's a huge break for Mark, who has dedicated his life to his job since the death of his girlfriend years before. But on Mark's first day, he is thrust into the path of the killer. A man is found wandering the streets, badly tortured and with his memory in tatters. He knows only that his girlfriend is still being held in the woods he's escaped from. Mark knows that by fleeing, the man has sealed his girlfriend's fate. If they can't piece together his experience by daybreak then she will die in his place... The 50/50 Killer is an astonishing and terrifying novel of love, death and the choices in between.