Mary Beth has egg on her face when the Laceys' home is robbed, and it's revealed she doesn't follow the same home safeguarding tips she gives to civilians. Meanwhile, a high school athlete's death is investigated.
A rash of AA meeting robberies sends the detectives to pose as alcoholics. At a co-dependents' meeting, Chris is surprised to see Donna, her father's girlfriend.
Cagney and Lacey try to bring down a scam artist who promises to get messages to the departed by giving them to the terminally ill, but face difficulty in that nobody seems to feel victimized.
The detectives question if a deaf girl could have committed the murder of which she's accused. David Keeler wants Christine to forgive him for representing Mansfield.
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.