Someone is following Sarah Lucas. When she peers down from her apartment window late one night, she sees him hovering in the shadows. And what about the other strange things that have been happening to her? The old woman who appears every so often to give Sarah a cryptic piece of advice and then vanishes? The mysterious gleaming stone that turns up in the mail, a universe of tiny stars suspended in its depths?

But there's no one Sarah can trust with her story. Her journalist parents have been killed in a freak plane crash, and her older brother, Sam, a scientific genius, has disappeared under suspicious circumstances from the top secret institute where he works.

Sarah couldn't be more alone in the world, until the day she meets Angel Muldoon, a half-Gypsy stable boy who carries a secret of his own. Together they will begin an incredible journey to another world, where they must return the stone to its rightful place and keep the forces of unimaginable evil at bay.