When kids begin mysteriously disappearing from school, amateur sleuth Llio decides to take the law into her own hands and scrutinise the sinister Miss Caradog. Always in the shadows, silent and brooding, there is something not quite right about this new teaching assistant.
With the help of her reluctant yet loyal friend Owen, they launch an elaborate detective investigation into these strange goings-on. Loading suspiciously hefty bin bags into the back of her car, leaving classrooms without students, and mysterious 'red paint' covering her desks - Llio knows Miss Caradog is up to something, but how far will she be prepared to go to prove she is right?