Angus is forced to be much more grown up than he wants to be — he has to look after his sister and baby brother and he's only eleven. He dreams of being wild and free like the pirate in a story he tells Imogen and Leo but instead he spends lots of time changing nappies and cleaning up. His mum, a TV star, calls him Mr Dependable, but he can barely cope and knows that another baby in the family could mean disaster. He must find out about contraception, and convince his mother that he is still a child. Finally his friend Rindi, who has troubles of her own, gives him an idea that delights all the children and makes clear his need to be free.