This thrilling third installment of the Wild Robot series takes readers on a new adventure under the ocean and to the frigid northern waters where Roz may have to make the ultimate sacrifice.

Life for Roz and the animals on their island is perfect: wild, natural, harmonious. Her son Brightbill has even found a mate! But then, one day an injured seal washes ashore and warns of dangerous, cloudy waters that are flowing toward the island—and soon the animals are forced inland to fight over dwindling resources.