Harper hates crowds and has a strong distaste for humanity in general. A summer spent in the bustling city of London was not on her bucket list-especially not tagging along behind her nagging mother.

But when a teen from the Greek Dark Ages mysteriously appears in the very crowded British Museum, Harper decides to rescue the boy who's even more out of place-and time-than she is. With the help of her uncle, they'll need to keep Homer away from the British authorities, evade a tomb-robbing ex-archeologist, and figure out how to get this Palikari man back to his own time before he's captured.

As they escape near-kidnappings, terrible yogurt drinks, and Harper's mother's lectures, Harper finds herself warming up to Homer. Something that hasn't happened with anyone since the incident with her father back in Arizona.

Will she learn to love again? Or will an ex-archeologist snag the historical find of the millennium-and the only person she's felt safe around in years?