Inside a Toledo synagogue, an archeologist and a writer find a key with mysterious inscriptions written in Arabic and Hebrew. What door does the key open? Will it lead them to some fabulous treasure?

El Misterio de la Llave 2008, Santillana USA Publishing Company, Madrid, Spain

ISBN-13: 9788497130578

Spanish

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El Misterio de la Llave 2006, Alfaguara Infantil

ISBN-13: 9788497130035

Spanish

Trade paperback

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El Misterio de la Llave 1998, Santillana USA Publishing Company, Madrid, Spain

ISBN-13: 9788429440409

Spanish

Trade paperback

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