A serial murderer has begun targeting Tinder daters. The first victim is in her mid-thirties, a lawyer who specialized in rape cases, a self-declared Tinder addict. Her neck is a canvas of puncture marks, her apartment awash in blood--though not enough to account for the amount she's lost. The one solid clue, tiny fragments of rust and paint in the puncture wounds, only leaves the investigating team baffled. And then, two days later, a second murder: a woman of the same age, a Tinder user, the puncture wounds and blood. The chief of police turns to the most successful murder detective the police have ever had--but Harry Hole is no longer with the force. He promised the woman he loves, he promised himself, that he'd never go back, not after the cop-killer case. But there's something about these murders, something in the details that the investigators don't seem to notice, that catches Hole's attention. Now, despite his promises, Harry throws himself back into the hunt for his nemesis. -- Adapted from dust jacket.