Warm is the smallest pup, the one his father calls the heart of the pack. But all Warm sees is his bigger brothers Sharp and Swift, even his sisters Pounce and Wag, winning all the wrestling matches. Just as Warm is finding his place, enemy wolves destroy and scatter the pack. Warm helps lead the pups away from the fight, only to find himself alone with four pups to defend and feed. Can he be both the heart and the head of a new pack? Does he have to choose the aggressive leadership style of his father and brothers? Or is there another way?