Milly is 9 and ill in hospital but she is lucky because she has the 'best Gran in the world' (who secretly fancies the doctor!) But ssh don't tell anyone! Hospitals can be scary old places, especially at night, with what seems like a labyrinth of corridors. But just when things get tough, Milly is helped through the worst times by her secret friend. It just so happens that her secret friend is a Minotaur!