Victor, the ghost, is desperate to get off dreary Black Hall Island, so he steals a ride on an unsuspecting tourist boat back to Bywater-by-Sea. Two other ghosts - the terribly vain Flora Rose and the lonely but friendly Billy - know he is up to no good, so they follow him. While Tom is distracted, trying to stop a corporation from building a theme park over his Field Craft hut, Victor sees his opportunity to take over the world.