Kwiatkowski is a true detective who likes milk and Carpenter's chewing gum. Instead of homework, he has night ambushes, instead of children's entertainment - dangerous adventures. Any most complicated crime is doomed to failure if he takes up the case. Komisarek, a school caretaker, sees ghosts during the night shift. Kwiatkowski considers mysticism to be adult fears, but agrees to investigate. The detective will have to fight with the unknown and find out what secret the pink ghost hides.