A mysterious penguin and a pair of automated techno-trousers are the catalysts for a fast-moving comedy thriller, in which mild mannered Wallace finds himself an unwitting accomplice to a daring diamond robbery. His faithful dog, Gromit turns detective in a desperate attempt to save his master, but even he finds his ingenuity tested to the full as events build towards a spectacular and hilarious climax - a train chase around Wallace’s living room!