Boomerang Lookout is the smallest "kit" in his litter. Worse, he is also named after one of the infamous "Lost Six," a group of prairie dogs who left the Ward, their home, and never returned. When young Boomer decides to venture outside the Ward, he learns the real story of his namesake. The original Boomerang Lookout was the first king of The Tubes, an underground city populated by a band of small animal species bound together by a union called the Alignment of the Wee. But when control of the Tubes was passed to the rat Vinny Whiskers, the Wee were betrayed and evicted from their underground Eden by an army of rats. Ever since, the Wee have searched for a way to win back their home. When a young prairie dog emerges with a legendary name, a showdown between the Alignment of the Wee and the Rat Nation seems inevitable.