A large family gathers in the country side for their very elderly grannies' birthday. One gift happens to be from their ostracized, black sheep nephew, and upon opening it, the two loveable grannies turn into rabid, flesh-eating monsters.
Claude and Pierre are brother and sister yet it is apparent early on that they are physically attracted to each other. In order to suborn their feelings they enter into relationships with others but nothing they do seems to work - they are always drawn back to their same fatal attraction.
