It's the first week of summer break and fifteen-year-old Mark McBrantly and his three friends are already in trouble. While breaking into an abandoned motel, the four of them discover a box full of mysterious files. Mark investigates the strange documents, and soon finds himself caught up in the paranormal world of the Space Truckers--an intergalactic organization with only two objectives: to maintain the delicate balance of the universe, and to recruit new blood. What Mark doesn't know is--he's being tried out for the position.