When a woman is murdered in Leeds, the police struggle to catch her killer.

In the devastating wake of more linked murders, the police face the prospect of a serial murderer at large; however, the testimony of a survivor could turn the tides.

The investigation spreads to Bradford with the murder of another young woman; a female police officer is tasked with dangerous undercover sex work.

When another woman survives an attack, detectives hope they might have a chance of finding their man; a driver in Leeds emerges as a prime suspect.

The police review previous attacks in an effort to find more victims as the murder rate rises; the delivery of a letter from the murderer enrages George Oldfield.

The West Yorkshire Police launch a massive public appeal to root out the killer; some detectives begin to voice concerns about the direction of the investigation.