The action-packed third installment in Peter Brown’s internationally bestselling The Wild Robot series takes Roz on an under-the-ocean journey to save her beloved island! Life for Roz and the animals on their island is perfect: wild,naturalharmonious. Her son Brightbill has even found a mate! But thenone day an injured seal washes ashore and warns of dangerouscloudy waters that are flowing toward the island–and soon the animals are forced inland to fight over dwindling resources. Roz calms and organizes the animalsbut the poison tide takes a terrible toll on the island. And when the robot discovers that her new body is waterproofshe marches into the waves and sets out across the oceandetermined to stop the poison tide. During her undersea journeyRoz encounters amazing geological formations and incredible creaturesand she sees the devastation caused by the toxic waters. Creatures she meets along the way direct her to a mysterious character known as the Ancient Sharkwho explains that the poison tide is caused by a huge station that floats on the waves; a station operated by humans and by robots. To stop themthe Ancient Shark is prepared to attack with an army of sea creatures. HoweverRoz hopes to find a peaceful solutioninstead. Can the wild robot save the ocean and her island and everything she loves? 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.