A junior copywriter at a London ad agency, Cynthia Fishbein is the original good girl. She works hard, never complains, and takes care of everyone around her. Even Cyn’s therapist tells her she’s too nice. But all that’s about to change when a catty co-worker steals one of her ideas.

So Cyn goes her one better: She steals the woman’s identity.

Suddenly she’s breaking out of her shell, concocting a wickedly brilliant scheme to salvage her career–and maybe get a little revenge in the process. And once Cyn gets started, she just can’t stop. Soon she’s breaking the #1 rule of group therapy by dating Joe Dillon, the group’s sexy commitment-phobe. Leading a thrilling but terrifying double life, embroiled in a deliciously forbidden affair, she is having the time of her life–until her scheme starts to backfire in a major way. And unexpectedly Cyn is faced with a crisis that threatens her career, her relationship– and just might finish off her sterling reputation for good.