The Grand Babylon Hotel opens with New York millionaire Theodore Racksole's demand for an "Angel Kiss" --an American concoction the Grand Babylon does not serve. Racksole and his daughter Nella are on vacation, but quickly find themselves running the hotel, after Theodore's impulsive purchase of the establishment from founder and owner Felix Babylon. Soon the Racksoles are rushing to solve the mystery that threatens the reigning Prince of Posen -- and Nella's future. The hotel itself opens possibilities for adventure, discovery, and wonder that the Racksoles had never anticipated....