After her boyfriend cheats on her with her best friend, Celeste Arden is left heartbroken and homeless. When she's rescued from a dangerous encounter by Damien Cross, he asks her to pose as his fiancée—the missing heiress Vivienne Sterling. Realizing that marrying Damien would make her ex-boyfriend's "aunt by marriage," Celeste agrees. As she struggles to keep up the charade, Celeste repeatedly escapes exposure with Damien's help. Along the way, the two fall in love.