A tale of friendship between two unlikely pen pals: Mary, a lonely, eight-year-old girl living in the suburbs of Melbourne, and Max, a forty-four-year old, severely obese man living in New York.

Cheese-loving eccentric Wallace and his cunning canine pal, Gromit, investigate a mystery in Nick Park's animated adventure, in which the lovable inventor and his intrepid pup run a business ridding the town of garden pests. Using only humane methods that turn their home into a halfway house for evicted vermin, the pair stumble upon a mystery involving a voracious vegetarian monster that threatens to ruin the annual veggie-growing contest.