The world is full of monsters. They are up to mischief at night. But don’t worry, they are kept in check by secret agents. Nelly Rapp only learns that her mother was once a heroic monster hunter when she uncovers a family secret. It is clear that Nelly wants to follow her mother’s example,but she starts to have doubts. Who needs to be protected from whom? Does being different make you a monster? The film tells of friendship and tolerance in a funny and sometimes a little scary way.