A young boy is assaulted by a gang of thugs, and although he is reluctant to press charges, his brother decides to take matters into his own hands. Det. Sgt. Roach investigates an indecent assault and attempted abduction outside a school, but the attacker manages to get away. P.C.s Litten and Carver are at odds when Carver takes an interest in social work at a youth club. (thetvdb.com)