La robot y los animales de la isla parecen tener una vida perfecta. Sin embargo, un día aparece una foca herida y da la voz de alarma: se acercan aguas contaminadas. A partir de este momento, todos están en peligro.

Roz calma y organiza a los animales, pero las aguas tóxicas dificultan cada día más conseguir comida y hallar refugio. La robot descubre entonces que su cuerpo es impermeable a la marea venenosa y se impone una misión: encontrar el origen del peligro y acabar con él.

Para cumplir su objetivo, hará un emocionante viaje submarino, donde encontrará paisajes y criaturas increíbles, aunque amenazados por la devastación. Podrá Roz salvar el océano, la isla y a los seres que ama o la marea venenosa acabará con ellos?

Una emocionante fábula moderna que lleva a los lectores por las heladas aguas del norte y pone a su protagonista al borde del riesgo más grande de todos.

ENGLISH DESCRIPTION

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, 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.

Roz calms and organizes the animals, but the poison tide takes a terrible toll on the island. And when the robot discovers that her new body is waterproof, she marches into the waves and sets out across the ocean, determined to stop the poison tide.

During her undersea journey, Roz encounters amazing geological formations and incredible creatures, and 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 Shark, who 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 them, the Ancient Shark is prepared to attack with an army of sea creatures. However, Roz hopes to find a peaceful solution, instead. Can the wild robot save the ocean and her island and everything she loves?