The accomplished Corinthian Sir Richard Wyndham is wealthy, sophisticated, handsome and supremely bored. Tired of his aristocratic family constantly pressuring him to get married, he determines to run away after meeting the delightful, unconventional heroine Penelope Creed. Penelope, literally, falls into his life late one night as she hangs from the window of her aunt's house - she too attempting to escape the pressures of forced marriage. The two allies become embroiled in a series of hilarious madcap adventures as they crossdress, run into escaped criminals and save people from their own dramatics. Little do they predict their feelings for one another blossoming into romance.