Hilary Westfield has always dreamed of being a pirate. But the Very Nearly Honourable League of Pirates rejects Hilary's application because she's a girl, and her father ships her off to Miss Pimm's Finishing School for Delicate Ladies instead.

Expected to wear woollen dresses (petticoats not provided) and enthusiastically throw herself into activities such as Viennese Waltzing for the Eager Novice, Miss Pimm's is every bit as horrid as Hilary feared. However, a true pirate never lets dire circumstances stand in her way, and after a mostly dreadful first week, Hilary escapes and applies for a job with a freelance pirate known as the Terror of the Southlands. He offers her a place on his misfit crew, on one condition: she must find the famous treasure that's rumoured to contain most of the kingdom's lost magic. Hilary soon finds herself caught up in a dangerous quest, and on the run from her school governess and the most villainous pirate on the high seas!