The murder victim is a self-declared Tinder addict. Two days later, there’s a second murder: a woman of the same age, a Tinder user, an eerily similar scene. The chief of police knows there’s only one man for this case. But Harry Hole is no longer with the force. He promised the woman he loves --- and himself --- that he’d never go back: not after his last case, which put the people closest to him in grave danger. But there’s something about these murders that catches his attention, something in the details that the investigators have missed. Now, despite his promises, despite everything he risks, Harry throws himself back into the hunt for a figure who haunts him, the monster who got away.