After running away from home, Whiskers and Dapple must navigate a world that has not forgotten their family's exploits. The challenges they face lead them to discover family secrets and buried history, where consequences must be dealt for earlier actions. The young mice are adaptable, but surviving is harder when they have nobody but each other and vicious shadows from the past. Beyond it all, an even larger threat prepares to spread its wings...

When their mother dies, five little mice find themselves alone in an unforgiving world of constant danger. Two are taken by an eagle, and to make things worse, ice-season is coming. Without their mother's guidance, the remaining mice must leave their home mountain for the unknown to save their littermates and their lives. Meet Feather, Snowy, Acorn, Spotty, and Twig on their journey beyond darkness, hail, and fire.