D.S. Roach goes to the hospital to talk to a young man who was slashed in the face with a knife - the fifth is a series of ""steamer"" attacks, where knife-wielding youths have held up restaurant patrons. D.C. Dashwood receives a tip-off about the steamers' next target, and the restuarant is filled with undercover police officers. P.C. Edwards is jealous that he and Carver didn't get a free meal paid for by the Met, and the steamers are caught when they raid the restuarant. P.C. Melvin investigates a strange smell from a flat used by junkies, and finds the body of an elderly man who suffered a heart attack. Melvin can't believe the old man was a junkie. (thetvdb.com)