"Misión Merlín." Originally published in English by Random House in 2004 under the title: Summer of the sea serpent.
Summary:
Jack and Annie travel in their magic tree house to the land of the mystical selkies to seek a magical sword for Merlin. Jack y Annie viajan en su casa en el árbol mágico a la tierra de los místicos selkies a buscar una espada mágica de Merlín.
Series:
La casa del árbol ; #31 Osborne, Mary Pope. Magic tree house series. Spanish ; #31.
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