After a bomb hits their London school in the winter of 1941 and their father is severely wounded in battle, the Bennetts start a new life in sleepy Dorset, England. It is the summer of 1942 and they are enjoying their summer vacation from school when someone starts letting a local pig escape his enclosure and wreak havoc in the village. The Bennett children and Kate, no strangers to adventure, along with Zorro their dog, decide to investigate. While looking into this petty crime they stumble across a much more sinister one which could have serious consequences for the war and their own safety.