Hill and Renko handle a domestic call involving an old man threatening his neighbors with a shotgun; Hudson looks for the informer in his gang; and Joyce asks Furillo for advice about the Downey case.

Belker tries to renew his expired driver's license; Renko tries to take his father home from the hospital; LaRue rehabilitates himself with Furillo; and everyone follows the trail of the gun used to kill two officers during a burglary.

The rats return; Esterhaus is hospitalized for tests; Bates, Coffey and Joyce try to protect a woman and her children from her abusive husband; the latest cop killing looks to be a hired gun copying the random killer; and the corruption investigation strikes close to Hill Street; Hill Street gets word of the murder of Marty Nichols.