Amber Brown is one happy camper. She and her best friend, Justin, are spending the summer at Camp Cushetunk. Learning to ride Cinnamon, the sweetest horse ever, is so amazing that Amber doesn't even mind shoveling her poop.

Then Amber becomes the target of a series of pranks. Certain she knows who is behind them, Amber and her friends come up with the biggest prank ever to get revenge. But the outcome is not what they expect.

Turns out horsing around can lead to big trouble. But sometimes, Amber is surprised to learn, big trouble can lead to big changes for the better.