Title: Summer of the sea serpent
Description: Jack and Annie travel in their magic tree house to the land of the mystical selkies to seek a magical sword for Merlin.
Subjects: Juvenile fiction, Fiction, Magic, Brothers and sisters, Swords, Tree houses, Selkies, Time travel, Wizards, New York Times bestseller, nyt:series_books=2007-03-10, Siblings, Children's fiction, Time travel, fiction, Magic, fiction, Tree houses, fiction, Brothers and sisters, fiction, Jack (Fictitious character : Osborne), Annie (Fictitious character : Osborne), Magia, Spanish language materials, Animales fabulosos, Ficción juvenil, Cabañas en los árboles, Hermanos, Espadas, Viaje a través del tiempo, Siblings, fiction, Kinderbuch ab 8 Jahren, Mädchen, Junge, Schwester, Bruder, Geschwister, Baumhaus, versteckt, verborgen, Zeitreise, Abenteuer, Merlin, König Artus, Schwert, Excalibur, Caliburn, Eiszauberer
Time periods: Mittelalter