Inspector Kate Ford becomes worried about a staffie-cross that appears to be dangerously underweight. The owner claims to regularly feed the dog, and Kate is desperate to get an appointment with a vet, which proves to be no easy task. At Block Fen RSPCA, staff work to rehabilitate a lurcher that was tied to a fence and abandoned, and a trainee police dog competes against more experienced sniffer hounds in a mission to locate concealed firearms.