Strange things have been happening to Sam Sloane ever since he moved from San Francisco to Elizabeth and Jessica Wakefield's neighborhood in Sweet Valley. He can't figure out why everything in town looks so familiar--or why he's mysteriously drawn to a crumbling old mansion in town. When he visits a cemetary in the dead og night and sees a ghost who looks just like him, he tumed to Elizabeth and jessica for help. At first the twins think Sam is imagining things. After all, who believes in ghosts? But the more the girls get to know their new friend, the more they feel he's telling the truth. Something is out there. The twins are going to have to do a little ghost hunting of their own. But what happens if thye do discover a ghost? Or, worse, what happens if it discovers them?