Evelyn Allen has a problem. When her best friend, Liam's cousins push him to get a girlfriend, Liam begs Evelyn to fake date him. Evelyn agrees, even though she's hiding a big secret from him that she's never told anyone. Her problems reach their peak when she meets Liam's cousin for the first time. Clara Walker is probably the prettiest girl Evelyn has ever met, and she tries to keep up the guise of dating Liam while praying Clara won't treat Evelyn like an experiment and a dirty little secret.