Vintage clothing lover Caro decides she wants an ordinary life with an ordinary man after a failed relationship with an upperclass, cheating fiance. But it's terribly difficult to be ordinary when you're friends with a princess! Caro is offered the chance of a lifetime: swap lives with her good friend Princess Lotty of Montluce! The catch? She needs to play the girlfriend to Lotty's unwilling fiance, Prince Philippe. Lotty and Philippe have dreams of their own and marriage to each other isn't in cards, but not if Dowager Blanche, Lotty's grandmother, has anything to say about it! Swapping lives sounds all well and good, however if Caro and Philippe can't play a convincing couple, it's over! Philippe is as far from ordinary as he can get—not exactly Caro's type. Can an eccentric fashion fan and a pompous prince pull it off in this dramedy of romantic deceptions? What happens when they both start to believe the lie?