When thirteen-year-old Leandro takes the fall for his sister and is exiled into an ancient drone, he embarks on a perilous journey beyond the city's walls where he encounters mutant monsters, wasteland pirates, and fellow outcasts as he tries to save his sister and fellow Cascabeles from the oppressive regime.

Lucky and his Pack were able to defeat Terror's dogs. But their new world still holds many dangers. Now the Pack has come to the edge of a strange lake that seems to stretch on forever, and Lucky discovers that there is barely enough food to survive. As winter approaches and the dogs struggle for prey and shelter, Alpha makes it clear that his own needs come before the rest of the Pack. Meanwhile, the Fierce Dogs are determined to destroy Alpha's...

Jonas' life assignment is as the Receiver of Memory, where he will apprentice the Giver and become a storehouse of all the things humanity left behind when it entered utopia: color, emotion, and even more complicated secrets.

Lucky and Alpha have finally reached an uneasy peace, but tensions are still high -- and Alpha has made it clear that there are some dogs he will never fully accept. As the newly united Pack sets off in search of a home far away from the Fierce Dog camp, they discover that no territory is truly safe. When they encounter another group of dogs who survived the Big Growl, Lucky hopes that they can work together as allies -- but this new Pack may be their...