It was Percy and Annabeth's 3rd anniversary, after the Giant War, of course, and Percy booked a suite on a cruise ship, the S.S. Tipton. He thought it would be nice because it was a ship, and it also had a highschool they could attend for Annabeth. Jason and Piper, unknowingly, got the same cruise in a different suite. Frank and Hazel saw Percy and Piper planning their separate parties, and thought, 'why not?' Because Hazel believed a cruise ship is like a floating hotel and she didn't think she would get sea sick. Leo, being the Leo he is, decided to sneak on with Jason and Piper. The Stoll Brothers heard about this cruise and thought it would be a great place to prank people and came along as well.
Do you recognize the name of the S.S. Tipton? Zack and Cody happened to be on that ship, just like London Tipton, Bailey Picket, and Mr. Mosby. What happens now, especially if Zack is intent on figuring out what the heck the new teenagers on board are hiding and how to do the best possible pranks with the Stoll's.