Kitty is willing but only if the right cousin proposes. She once set her heart on the handsome cousin, Jack Westruther. Jack has no inclination to marry her anytime soon. But Kitty devises a plan wherein she convinces her cousin Frederick Standen to pose as her fiancé, hoping to make Jack jealous. But Freddy turns out to be Sir Galahad.
In London, Kitty tours the town with Freddy and gains a wardrobe when Freddy’s sister, Meg, takes Kitty under her wing. Then the mix-ups begin. Cousin Lord Dolphinton has fallen for a merchant's daughter in conflict with his mother. Meanwhile, Kitty’s French cousin, Camille, a professional gambler, tries to win the heart of beautiful Olivia Broughty, who is the object of cousin Jack’s dishonorable intentions. And when Kitty’s compassion leads to all sorts of unintended troubles, Freddy comes to her rescue.