When his parents go on an archaeological dig for the summer, Drew is sent into the care of his Aunt Blythe at the old family mansion. He finds the old house creepy, made creepier when he finds a bag of marbles with a warning note and an old, old, picture of a dead boy who looked exactly like him. Aunt Blythe, against Drew’s will, takes the bag of marbles, and that night he is visited by the ghost of the boy in the picture, also named Andrew.The two twins swap clothes, and they are whisked to each other’s times. Drew wants to go back to his time but Andrew, who was dying of a disease, insists that he should stay. Now, it is up to Drew to find a way back to his own time, before it is too late.