Theodora Fox is a lot of things, but a proper lady is not one of them. She has gone through tutor after tutor, and would rather be doing a crossword or a cifer than be a housewife. Not that there are men asking for her hand.
When her father goes looking for Vlad the impaler -better known as Dracula- he leaves Theo at a hotel. After her tutor quits and takes the money, she finds that there is an intruder in her room. Her ex-best friend who she dated for several weeks, Huck Gallagher, sent by Theo's father to keep her safe. Theo and Huck set out to find Theo's father, and they discover why, on Theo's 16th birthday, Huck went to Ireland.