Caitlin and her big brother, Dylan, are still getting used to shuttling between Mom's new little house and Dad's fancy new condo after their divorce. But summer means a solid six weeks with her dad. Finally, one toothbrush in one place and all her outfits together! So when her dad announces that he's gotten a new job on the fanciest, most fun, family-friendly cruise line -- and he's bringing his kids along -- Caitlin has mixed feelings. For about a minute! Then off she goes on the adventure of a lifetime on the biggest ship she's ever seen, the Wandering Princess, which is tricked out to perfection. But soon the pressures of being a crew kid get to Caitlin. She's already had to adjust to two new homes . . . will she be able to make the Wandering Princess her third?