Beloved forensic detective Lincoln Rhyme is back in this fiendishly clever short story from New York Times bestselling Jeffery Deaver! Forensic scientist Lincoln Rhyme and NYPD Detective Amelia Sachs are dumbfounded when they encounter an unsub like they have never seen before. An unknown subject is using dating apps to work his way into the lives—and hearts—of his victims, all with the goal of utterly destroying them psychologically and emotionally . . . for his pure pleasure. A killer in the makingRhyme recognizes the trademark sadism of a future serial killer, but the man has been meticulously careful—indeed, stopping just short of illegal behaviour, ensuring that the criminalist's forensic skills are useless against him. Will Rhyme and Sachs be able to stop the ruthless perp before the inevitable happens and he decides that breaking people metaphorically is no longer enough?Can you catch a sadist before his first kill?