Living on a rundown shipwreck, Mr. Fish one day discovers a hyperactive young sea dragon Pip - who had mistaken his home for a junkyard - pilfering his belongings. The heated argument that ensues leaves both their houses in ruin. But there is hope! Embarking on a seemingly impossible quest in search of the mythical "Shimmer" to grant them a wish, there’s only one problem: someone else is on the hunt…

The story follows lifelong best friends Maggie and Abby as they go through their first growing pains of adolescence, uncovering a secret world that connects in mysterious and wonderous ways. The action-adventure story begins in a place unique to kids: a pillow fort. Soon, the friends learn their pillow forts are connected not only to each other, but also to a huge network of pillow forts around the world — from across the street to the wilds of Alaska! Maggie and Abby are finding out just how far they can go when they put their imagination into action and how much fun they can have when they unleash their creative spirits.