SIX. WEEKS. That's how long Maggie's been waiting for her best friend and partner in crime, Abby, to come back from Camp Cantaloupe. Half of summer break may have been lost, but Abby is finally coming home! Only when Abby arrives, she's. different. All that New Abby wants to do is talk about camp things and plan campy activities--she even has the nerve to call Maggie's massive, award-worthy pillow fort a "cabin." But hey, at least she's willing to build a "cabin" of her own. And when Maggie discovers that a pillow in the back of her fort mysteriously leads right into Abby's new one, even New Abby can't resist the chance for adventure.

Soon they're adding links and building more forts, until Maggie looks behind one pillow too many and finds herself face-to-face with . the authorities. Turns out their little pillow fort network isn't the first to exist. A massive network of linked-up pillow and sofa forts already spans the globe, and the kids who run it are not happy with Maggie and Abby. With just three days to pass the North American Founding and Allied Forts Alliance's outrageous entrance requirements or lose the links forever, Maggie and Abby pull out all the secret-agent stops to try to save their network--but it just so happens that Maggie's fort might actually hold the key to a worldwide mystery that's gone unanswered for generations. There's only a little bit of summer left to burn, and Maggie and Abby are both determined to win back their pillow fort freedom. But can their friendship--and their scrappy network--survive the mission.