Animated comedy following the loveable plasticine pals in which they set up a lucrative window cleaning business. While working they meet wool shop owner Wendolene (Anne Reid) and Wallace becomes infatuated with her. Meanwhile, Gromit becomes interested in the case of some disappearing sheep, believing Wendolene's dog to be responsible. However, the devious dog frames Gromit and Wallace must pull himself together in time to save the reputation of his friend.