Posy Pinkerton’s life has been smooth sailing between her fiancé Tom, her burgeoning career as a medical illustrator, and side hobby as a visual artist. But after a chance encounter with Jack, a handsome and worldly businessman, Posy’s shell begins to crack. She finds him mysterious and he finds her charming, and for Posy it is an opportunity to try on confidence for size. Posy is reluctant to take it any further than petty flirting, until her polar-opposite cousin Laura pushes her for one last fling before settling down with Tom. Posy’s growing desire to break free allows her to exercise her inner self with Jack, an alter ego she’s created called the Queen of Sin. Little does Posy know, as she’s being swept up by Jack, she’s really making a deal with the devil.