As returning Detective Mike Logan joins the Major Case team, Detective Goren finds himself confronted again with Nicole Wallace (guest star Olivia D'Abo) -- his murderous nemesis -- when he and Detective Eames check out the drug-related slaying of a city health inspector. The key link is the victim's brother Evan, (guest star Kevin J. O'Connor), a recently widowed medical examiner who is romantically involved with the re-surfaced Wallace, and the investigators fear that the man's young daughter might be Wallace's next victim.
Detective Logan gets his first Major Case and partners with Detective Barek to probe a series of murderous Mom-and-Pop jewelry heists. However, as Logan zeroes in on a drug-addicted young loser Johnny as his suspect (guest star Peter Scanavino), his instinctive methods cause concern among his fellow law enforcement officers. When the detectives arrest a twitchy female accomplice, they pick up the scent of an older woman who not only is a career criminal, but could be the driving psychological force behind the crimes.