When he moves from Los Angeles to Providence, Rhode Island, Kenny takes in instant dislike to the hot, old-fashioned town. But his feelings of bordom turn to shock when he discovers that his new house is haunted by the spirit of Caleb, a black slave boy. Over two hundred years ago, Caleb was murdered. Now, he wants Kenny to return with him to his time - to stop Pardon Willinghast, a slave trader, from leagolizing his proffession and killing Caleb in the process. But in the space of minutes, both boys become locked in a series of events that could leave them both trapped in the wrong time, prisoners of the very man they're trying to stop. It seems impossible, but it's true ... their lives depend on a small, shiny object from modern-day California.