The Warriors series meets Redwall in this first book in an epic animal adventure series set in the subway tunnels of Brooklyn. Hopper is just an ordinary pet shop mouse before he escapes. Soon he finds himself below the bustling streets of Brooklyn, deep within the untamed tangles of transit tunnels, and in Atlantia, a glorious utopian rat civilization. But all is not what it seems. Though Hopper is treated as a royal guest, he misses his siblings...

Althought Felina the cat queen is gone, the subway tunnels are still dangerous, not only because of Hopper's rogue brother Pup and his arachnid companion Hacklemesh, but also due to a secret Firren has been hiding that worries her more than the disappearance of her daughter, Hope. Includes a bonus story, ATLANTIA RISING: How it All Began.