Avenging Angel

S4 E4: Frank Desmond, a heroin addict Kelly helped convict and send to prison, gets out of jail. Desmond proceeds with his friend, Eddie Feducci, to get Kelly in revenge. They dissolve a sleeping potion and then break into Kelly's house and inject heroin into the unconscious Angel. But racketeers, Joe Thurgood and Harold Sims, see Desmond entering Kelly's house and assume that he and Kelly are responsible for stealing his missing heroin valued at $2 million. After Kelly denies any part in the theft--the racketeers kidnap her and Desmond and again inject heroin into both of them, knowing they will confess during the painful withdrawals. Alone with Kelly and in a stupor, Desmond confides that he has hidden the cache of stolen drugs and had hoped to sell it upon his release from prison. Meanwhile the other Angels follow a string of clues to learn the hostages' whereabouts and arrive in time to save Kelly and Desmond from sure murder.