The police struggle to catch the killer of a woman murdered in Leeds, and a desperate mother is forced to make a difficult decision.

The police face the prospect of a multiple murderer at large in the wake of more linked murders, but the testimony of a survivor could turn the tide.

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

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

The police revisit historic attacks in the hope of identifying further victims, and George Oldfield is fired up by the arrival of a letter from the killer.