DI Chappel and Sgt Robinson travel to Sheffield to uncover the reason that young girls from a children's home are becoming prostitutes in London. Chappel offers a roof to PC Hutchins.

DI Chappel and Sgt Robinson uncovr a London pimp's connection to the children's home where he recruits child prostitutes. Chappel seeks comfort in the bed of a colleague.

DI Chappel and PC Hutchins work undercover to investigate the gambling operation at The Jupiter nightclub.

The Vice Squad investigates a massage parlour where Eastern European girls are being forced to work as prostitutes after being illegally smuggled into the country. Sgt Robinson's marriage gets emotionally involved with a witness.

Desperate to crack the Eastern European sex-slave ring, DI Chappel betrays an old friend, with deadly consequences.

The Vice Squad investigates the murder of a pimp. Sgt Robinson comes under suspicion for the murder. DI Chappel begins a relationship with the victim's mother.

DI Chappel has to sacrifice his new relationship to save Sgt Robinson from the murder accusation.