She came to find her friend. Instead she found a killer. Serial killer expert Darby McCormick gets a call from FBI Agent Jackson Cooper, who has been contacted by a woman who's been in hiding for twenty years. She was one of the only survivors of a murderer who has been carving a dark path across America for decades. Cooper believes he may have tracked this psychopath to the wilds of Montana. Now, he needs Darby's help to bring him in. But when she arrives Cooper has vanished without a trace. Something is very wrong - and as the trail goes cold, Darby is all alone in a strange town, stalked by an unseen predator who wants to add another victim to his collection... (Praise for Chris Mooney) 'One of the best thriller writers working today' Lee Child 'Chris Mooney is a wonderful writer. Compelling, thrilling and touching' Michael Connelly 'Harrowing, gripping, haunting' Harlan Coben 'It will keep you up past your bedtime' Karin Slaughter 'A scary, breakneck ride with thrills that never let up' Tess Gerritsen