Cassie and her two best friends, Greta and Keagan, are so over boyfriends. But just because the girls are anti-boyfriend doesn't mean they're anti-boy. So they make a pact for the summer: They'll each kiss ten different guys before school starts—no commitments, no drama, just fun. Sounds easy enough. Then Cassie meets the perfect guy (nine boys too soon), and the pact starts to seem like a terrible idea. Not to mention Boy Number One turns out to be her best friend's ex. Ugh—Cassie's summer just went from carefree to complicated faster than she can say "heartbreaker."