A boy named Gilbert, has come back to finish unfinished business when he was alive. And now, Zack is the only one who can see him, so Zack is being blamed for all the pranks Gilbert is setting up. Pranks are pulled all over Zack's house and the entire school. Zack, Spencer, and Cam must find out what Gilbert wants before he gets Zack expelled, kicked out by his father, or being killed.