A two parter where Mary Beth discovers that she has a lump in her breast, but she refuses to talk about it or do anything about it. Chris finds out when Harvey gets worried and sneaks out to tell her. Chris finally convinces Mary Beth to see a doctor and then to get a second opinion. Meanwhile the detectives must find a missing child. Cagney thinks the kid ran away because the mother was unfit. The mother thinks that they would look harder for a white child. Finally he turns up in an underground passage and Chris goes in after him. Mary Beth goes in for her surgery, but Chris can't be there because she is taking the sergeant's exam. But she gets back in time to learn that the operation is a success

Samuels' absence gives Cagney a chance to shine as temporary commander. Inspector Knelman gives her her orders - put Lacey on maternity leave. This is considered a classic episode because it is the one in which Cagney takes her turn as watch commande

A labor leader is killed. Once again, the victim seems to have led a blameless life, yet someone wanted him dead.