Castles in the Air is a musical comedy, with a book and lyrics by Raymond W. Peck and music by Percy Wenrich (additional lyrics by R. Locke). The story concerns two young men, Monty Blair and John Brown, who mistake an exclusive Westchester resort for an inn. They decide to pretend to be nobility, and Monty introduces John as a Latvian prince. Evelyn's uncle Philip decides to teach her a lesson about social climbing by taking her to Latvia, intending to expose John as an impostor. The plan backfires, though, because John really is a prince. The musical opened on Broadway in the Selwyn Theatre on September 6, 1926.