Molly Maneuver had the perfect life—until her brother Zack was born, that is. At first, he was a small bother, hardly worth noticing. But then he grew. And as Zack got bigger, his pranks and habit of picking-on Molly got bigger and bigger too.

Now, after two blissfully Zack-free years at Pearson Middle School, thirteen-year-old Molly is about to enter eighth grade. The only problem is, Zack is starting sixth. He'll be at Pearson for the first time ever this year. Every day. All day long. And he has horrible ways of making his presence known. Molly is sure this is going to be the worst school year ever.

But maybe not!

When Zack humiliates her in front of the entire school on their very first day, Molly finds a mysterious note in her locker, inviting her to seek help with her, "brother problem." When she follows the instructions inside, she discovers a whole new world of girls with bothersome brothers, in a top secret club, destined to make her life easier and much more fun this year. Welcome to the world of Brother Haters Anonymous.