Stowaways aboard a majestic ship, the kids must try to blend in and find the next clue. Hot on their tail, Rhonda, Milligan, and Ms. Perumal board a dirigible to catch up to them. Mr. Benedict and Number Two cannot hide their distrust from the eerily calm Curtain after observing the unnervingly joyful behavior of his devotees and discovering that he is using neurological techniques to create artificial happiness. Back at sea, the water polo team sneaks suspiciously towards the kids’ stateroom…