Valentine investigates an assault on the boyfriend and business partner of his estranged wife Sandra, but is puzzled when CCTV pulled from a street camera fails to back-up his version of events. When he reveals that he is being pressured by a loanshark into paying money for protection, Nadir and Hunter set up an operation to catch the offender in the act. Meanwhile, Hollis and Kent deal with a spate of criminal damage on family cars, and suspect a recently-widowed elderly man who is being targeted by local youths. Whilst on suspension, Gold makes a citizen's arrest on a woman she suspects of dealing drugs, but Powell and Murphy fail to find any incriminating evidence.