Lindsay Boxer and her new partner in the San Francisco police department run flat-out to stop a series of kidnappings that has electrified the city: children of rich families are being plucked off the streets together with their nannies - but the kidnappers aren't demanding ransom.

Amid uncertainty and rising panic, Lindsay juggles the possibility of a new love with an unsolvable investigation, and the knowledge that one member of the club could be on the brink of death.

Ike Quintana, an addict, voluntary points the police to Alfred Brinkley, a madman who hears voices in his head; while Boxer is wondering how to contact him, he spontaneously turns himself to Lindsay herself, going to her house.

Brinkley is defended by Mickey Sherman, an excellent lawyer who has to fight the People, represented by Yuki Castellano, together with Lindsay and Claire one of the member of the Women's Murder Club.

A parallel plot deals with a band of pedophiles, led by Paul Renfree, a man who was molested when a boy and now, with the help of his wife, kidnaps young guys with the intent of selling them to the child trafficking mafia; when he tries to kill Madison Tyler, SFPD tails him until they get their identity and manage to stop him and his accessories.