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.