Chantal is a planner, and her summer-before-senior-year plan requires best friend Jillian, resumé updating, and studying for AP classes. Jillian wants something different and is afraid to leave introverted Chantal in the dust. All that changes, though, when popular classmates Parker and Will suspiciously start hanging out with the girls.

Chantal only sees one thing: Jillian ditching her for Parker—a guy who can't even be trusted! Chantal hatches a new plan, one that will expose Parker and Will for what they truly are, and along the way, get her best friend back with the littlest lie and a lot of mouthwatering cake. After all, what are best friends for?