Burnside is seconded to Sun Hill to catch a pair of serial rapists operating in the area. As Burnside tracks down a known sex offender, he grills him for his whereabouts, but a call soon comes in that there has been another attack. Consulting the victim, who got a good view of the suspect, Burnside leads to an undercover team to a restaurant and the victim identifies a waiter. As the man continues to shut down questions in interview, Rawton consults the man's parents, and they identify a work colleague who they feel is a bad influence on their son. Discovering the man's car matches the description identified by a victim, a claim is made that blows the case wide open. When the pair are bailed they slip surveillance, and one of them is found seriously assaulted.

This episode was broadcast out of production order - using the newer closing titles and fonts not officially introduced until later in the series