After a harrowing journey, the four bears finally arrive at Toklo's former home in the mountains. Toklo is thrilled to be surrounded by familiar sights and warm memories of his cubhood. Yet Toklo's homecoming has come at a price. Yakone is dangerously ill, having lost part of his paw in a flat-face trap, and Kallik is racked with guilt that Yakone's decision to join her on this quest may cost him his life. As the struggling polar bears feel the pull to return to the ice, and Toko begins thinking about a life in the mountains, Lusa is left to wonder where she belongs. Is she ready to find her own way if it means leaving her friends -- the only family she has left?