For generations, four clans of wild cats have shared the forest. When their warrior code is threatened by mysterious deaths, a house cat named Rusty may turn out to be the bravest warrior of all.

As the four bears head toward warmer territories, polar bears Kallik and Yakone wonder if they've made a mistake leaving their natural home, while Toklo, desperate to leave the struggles of their journey behind, thinks about leaving the group and starting a new life on his own.

"The four bears have reached the mountains where Toklo spent his cubhood--but they soon discover that the home Toklo has returned to is nothing like the one he remembered"--