SPOILER ALERT
When Amanda Bosch is murdered, Lt Coffey reluctantly assigns Kathleen Mallory to the case, with specific instructions. Her research on the victim's computer leads her believe that someone in the building that Betty Hyde lives in is the killer. Hyde, a gossip columnist hired Bosch to do research for her. The killer had come to Bosch's apartment to clean obsessively after the murder, so her must have spent considerable time there. Someone who trained Bosch's cat, Nose, to dance on command, perhaps through fear. She finds only one missing name on the computer that is in the Roladex. She has the idea of putting herself in the Coventry Arms to trick the killer into showing himself. Given other information gleaned from her apartment, the man has to be over six feet; Mallory whittles the men in the building down to three that fit the profile. Judge Emery Heart is in line for an appointment to the Supreme Court, but her is a wife-beater, and possibly beat his mother to death. Eric Franz is supposedly blind; his wife was killed by a hit-and-run driver, with Eric looking on. Arthur, the doorman of the building saw the accident. Handsome Harry Kipling, a financial rep, is married to an ugly, but very wealthy heir, Angel. She has gotten him out of a number of scams and scandals and suspects him of an affair. Mallory hacks into the computer system of the building, that gives the residents daily schedules of events, etc. She sends incendiary messages to each of the suspects, whose wives may also see the notes.
At the same time that Mallory is investigating this case, the partnership of Mallory and Butler has taken on as clients the family of Robert and Sally Riccalo. They are experiencing psychokinesis, pencils and other objects flying around and objects falling off shelves. Even at the office of Mallory and Butler, things are moving. Justin, the son, appears to be frightened of the events. He is taken under Charles' care, being shown the magical tricks of his friends Max Candle and Malakhai, and all of their magic possessions in the basement.
In the end Mallory, with a strict schedule for getting the killer will find herself confronted by Harry Kipling, without her gun which has been stolen from the condo, only Candle's knife on the shelf. She calls for Charles to bring another gun from the office, and he is rushing to get to her. They will both be faced with the scary appearance of a sinister Justin, holding her gun, and she will overcome Harry, hogtying him before Justin can fire. Charles will get there and will start shooting an unloaded gun at Justin, who Mallory will also tackle. Sgt Riker and Martin will show up then. All has been recorded. Nose, shot during the altercation will survive.
In the process of her investigations, Mallory will reveal the corruption of Det Polanski, who watches the activities of the rich families in the building, will set some of them up, and them blackmail them. His corruption will be substantiated during the process.
Charles will find himself hallucinating the person of Louisa Candle who had composed Louisa's Concerto haunting piece used by Max during his shows. He uses her vision as a method of asking Amanda Bosch what happened to her. It is very creepy and alludes to the frustrations and mental issues of Charles for Mallory. The strange and cold personality of Mallory is continually evaluated by the various men in her life including the four who weekly play poker, a game from which Mallory was banned: Dr Edward Slope, Rabbi David Kaplan, Charles and Robin Duffy.