Katy can't stand the fact that her boyfriend, Peter, has changed so much since his wealthy uncle Jeremiah took him under his wing. In a fit of rebellion, she flies to Paris to attend cooking school. Lonely, she visits a schoolmate, Fabienne, who lives in a beautiful mansion in Paris. But it's Peter who answers the door.

Katy is devastated that Peter is in Paris--on business for his uncle, he claims--and didn't tell her. Soon Katy is wrapped up in the mysteries of the strange house, which is occupied by only beautiful, shallow people. And they don't seem to age. Then an accidental trip through the underground passages of Paris leads Katy to the discovery of an ancient book that just might hold the secrets to the mansion...