Greg's head is spinning when a man claims his identical twin is violent and threatening both himself and his girlfriend, and he tries to figure out if there is even another twin out there. A junkie is committing robberies at ATMs, and Jill's bonding with his mother may be the only way to bring him to justice. Andy gets medical news that he does not share with anyone, including Sylvia, and an attractive new PAA named Dolores arrives.

A nurse is strangled and stabbed to death. Suspicion initially falls on a mental patient at the hospital she worked at, but Andy and Bobby later learn she was having an affair with a married uniform cop named Tommy Richardson, and try to prove he did the crime. Jill uses a trick involving a soda can to get a mute suspect to confess. Andy's doctor comes to the precinct to get him to face his bad health news, but Andy loses his temper and throws the guy out of the 15th.