Josh Radnor

Weaver gets into trouble when she agrees to secretly treat the lover of her powerful new patron, Alderman John Bright (recurring guest star Bruce Weitz), for syphilis. When the patient suffers a severe allergic reaction, Weaver desperately tries to prevent her actions from becoming public, further compromising her ethics in the process. Meanwhile, Weaver's career continues to advance--at the expense of Romano's. Carter and Abby reassess their relationship. Kovac ruminates on his troubled career path while ministering to a rebellious teenage girl who claims she was sexually abused at a camp for wayward youths. And Carter cares for a nasty middle-aged woman who is slowly being poisoned.

Fisher & Diaz deal with the recently discovered body of a man missing for years. Meanwhile, Ruth sets the ground rules for a new live-in apprentice named Arthur, David meets an old acquaintance during an L.A. Gay Men's Chorus rehearsal, and Claire is surprised by her responsibilities as Olivier's new assistant.

Tracy Conley is found stabbed to death and buried under piles of garbage in front of an apartment building. The detectives eventually discover that she had spent her last hours with her Little Sister, a 15-year-old girl named Monique (Yaani King) who had discipline problems. It turns out Monique had set up Tracy to be mugged by a drug dealer. The Detectives believe the dealer, Arnold (Haasan Iniko Johnson), killed Tracy. But he claims he only took her purse, and says that a man jumped in to rescue her so he took off. In the meantime, the Detectives are suspicious of one of Tracy's colleagues, Dr. Craig Gerring, who is caught trying to steal Tracy's laptop.