Lincoln Rhyme and Amelia Sachs return to New York City to confront a killer terrorizing couples at their happiest--and most vulnerable. In the early hours of a quiet, weekend morning in Manhattan's Diamond District, a brutal triple murder shocks the city. Lincoln Rhyme and Amelia Sachs quickly take the case. Curiously, the killer has left behind a half-million dollars' worth of gems at the murder scene, a jewelry store on 47th street. As more crimes...

A woman awakes in the morning to find that someone has picked her apartment's supposedly impregnable door lock and rearranged personal items, even sitting beside her while she slept. The intrusion, the police learn, is a message to the entire city of carnage to come. Lincoln Rhyme and Amelia Sachs are brought in to investigate and soon learn that the sociopathic intruder, who calls himself 'the Locksmith,' can break through any lock or security system...