When D.S. Roach's case against Mickey Owen, a protection racketeer, is thrown out of court, Roach comes under pressure from the Flying Squad to convince Roxanne, a transvestite informant, to give evidence against Owen. Roach is reluctant, as Roxanne was badly beaten when he failed to protect her the last time she gave evidence. In spite of this, Roxanne finally agrees to testify, considering she has nothing left to lose.

Insp. Monroe has trouble dealing with a gang of boy-racers who are harassing and intimidating an elderly couple. When the old man dies after an altercation with the gang, Monroe is urged by Brownlow to show 'zero tolerance' to the youths. PC Smith gets close to a nurse at the St Hughs Nurses Home while investigating reports of a stalker in the area.