School's out and pranksters Miles and Niles have retreated to a perfect hideout in the woods, complete with snacks, games, books, sleeping bags, stream-chilled lemonade . . . and a stolen flag of nearby Yawnee Valley Yelling and Push-Ups Camp. But their leafy, lazy days darken when bully Josh Barkin and fellow cadets vow to get their flag back. It's war, but one that pits nimble minds against hard fists; and as pranksters know, the real art of war is winning without landing a single blow.

From bestselling authors Mac Barnett (Extra Yarn, Sam and Dave Dig a Hole) and Jory John (Penguin Problems, The Bad Seed) comes this latest installment in the hilarious New York Times bestselling series about the power of friends and good laughs.