The Boy in the Basement

After spending the Summer at camp, 12 year old Robert comes home to find something odd about his family. They look the same, but are they really his family? Later that night he finds a strange boy hiding in his basement. It can't be a coincidence. Could it? While Robert tries to discover why the boy is there, he need to find out what happened to his own family. Is the Boy in the Basement the key to getting his family back? Or is he the Cause?