"Misión Merlín." Originally published in English by Random House in 2003 under the title: Haunted castle on Hallows Eve.
Summary:
In their magic treehouse, Jack and Annie are again transported to King Arthur's realm, where invisible beings, giant ravens, and mistaken magic spells have a duke's castle in an uproar on Halloween night.
Series:
La casa del árbol ; #30 Misión Merlín Osborne, Mary Pope. Magic tree house series. Spanish ; #30. Osborne, Mary Pope. Merlin missions. Spanish.
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