One night early in the Second World War, Agnes Kinghof finds a body outside her block of flats, and her neighbour is disturbed by the appearance of a pig's head at her top-floor window. A mysterious person calling themself the "Pig-sticker" claims credit for both, and what's worse, the killer appears to be living within the block of flats. Agnes and her husband Andrew decide it would be a lot of fun to investigate, and they have to face down a prank war, cursed…