En esta doceava entrega de la serie La casa del árbol, Jack y Annie hacen un emocionante viaje al Ártico. Se quedan atrapados en una placa de hielo que empieza a agrietarse y se encuentran con un oso polar. ¿Es el oso su amigo o su enemigo? ¡Tendrán que leer el libro para conocer la respuesta!
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