 In the fifth-season opener, Cagney, Lacey and Lieutenant Samuels are forced to investigate one of their own. It starts when a junkie s broad-daylight burglary makes him easy prey for Cagney and Lacey, who happen to be across the street at the time. What isn t easy to take is the tip the addict (Tonyo Melendez) offers in a bid for leniency; he says he saw a cop pocket some heroin from a crime scene--a detective from their own 14th squad. Bypassing Internal Affairs, Chris and Mary Beth go to Lieutenant Samuels, who orders them to have the junkie ID the alleged felon--and it s a real shocker. Even more shocking is their suspect s behavior when they set a trap for him, a trap that could very well ensnare them all. (TV Guide)