Harris plays it close to the bone when he goes undercover in a psychiatric clinic as a patient. Inside, he targets Evelyn Ballantyne the unstable sister of a murder victim. The squad believe Evelyn may have killed her sister and is using the clinic as a means to evade the police. However, once on the inside Harris's own mental illness makes him sympathetic to Evelyn and he is soon caught between caring for her and his responsibilities as a policeman. While he manages to identify several other targets he must battle Homicide's insistence that Evelyn is guilty. Finally he is forced to pursue another target, allowing Evelyn to stray from his care and into he arms of the true killer. Harris' instincts come into play in the last moments when he nails the killer and upholds his duty as a police officer, but his attempts to save Evelyn from the darkness he knows so well flutters away as she steps into the unknown.