In Heartbreakers, four best friends found their share of boy troubles, leading to a list of must-follow rules for breaking up. Now Sydney, Raven, and Alexia are all taken again, but Kelly's still single. Her friends come to the rescue and devise the crush code—rules to turn a crush into something more. But when all the girls start to follow the list, there's trouble in paradise. Soon they're each crushing hard on guys that are most definitely off limits.