Dennis lives in a boring house in a boring street in a boring town. His Dad has banned cuddles, ever since Dennis' Mum left home to run a bar in Tenerife. Dennis also has a bit of a secret - he finds himself attracted to the colour and glamour of the fashion world and in an attempt to liven things up a bit, he goes to school in a dress. His Headmaster, Mr. Hawtree, is not amused and Dennis is expelled. Dennis has to find a way to get back into school and on the way uncovers some secrets that other people have.