DS Vik Singh goes undercover to a 'car cruise', where he becomes involved with a well-organised car ringing gang led by Kevin North. Meanwhile, DC Mickey Webb tries to cultivate an unofficial 15-year old snout named Tyro Shaw, in the hope that he will grass up his father, Steve Shaw. Singh poses as a car thief, and is soon in with the gang, even gaining a meeting with North's boss - Jennifer Salter. As Webb gets frustrated by Shaw's dead-end leads, Singh pushes the boy too far about his involvement with the gang.

Tyro Shaw threatens to blow DS Singh's cover in the car-ringing gang, but is convinced otherwise. Singh seems to have impressed both Kevin North and his boss, Jennifer Salter, who seems quite taken with him. Salter tells Singh the gang is moving on soon, and he realises he must get the evidence in North's office. As Singh enters the office, Webb realises that Tyro Shaw has set them up, and Vik is abducted by North and Salter. Webb convinces Tyro to tell them where Vik was taken, and CID narrowly rescue him from being set alight.