David Keeler defends Mary Beth after the community demands a Civilian Review Board investigate her role in a neighborhood dispute. Det. Petrie is promoted to Sergeant.
Cagney and Lacey go undercover on street corners to investigate a rash of middle-aged prostitute murders. Isbecki is thrilled to discover his new partner is a woman.
Chris is disappointed when she's passed over to fill in during Lt. Samuels' vacation. Harvey assists in a case involving kickbacks at a construction site.
When a refugee from El Salvador is slain, different people give wildly different opinions of the life he led to Chris and Mary Beth during their investigation. Meanwhile, Chris meets a friendly, handsome plumber at AA.
The theft of a valuable painting sends the detectives to upscale galleries, hoping to find out where it went. Christine realizes Nick is the opposite of David.
A Wall Street success with friends high on the police command chain is robbed, creating additional pressure to solve the case quickly. Meanwhile, Harvey Jr. visits home.