MI High is in danger of being exposed when cameras go up around the school as part of a good-manners initiative. But, when footage of the pupils' terrible behaviour is edited and leaked to the media, it seems someone wants to make St Hope's look worse than usual. The spies realise the Minister for Schools is guilty of altering the footage because she hates kids.

St Hope's is on red alert - nits are sweeping the country! But when they infest the school and the pupils take on the characteristics of criminals, the teen spies realise these are no ordinary nits. The chief suspect is nit nurse Nora Braithwaite. Daisy realises the only way to stop the infestation is to destroy the gross mother nit on Nora's head.