Eight-year-old Jack and his little sister, Annie, are playing in the woods during their summer holiday, when they find a mysterious tree house full of books. But these are no ordinary books . . . And this is no ordinary tree house . . .

Morgan le Fay - the owner of the Magic Tree House and all its mysterious books is missing and needs Jack and Annie`s help! They follow her clues to Japan where they find themselves in the middle of a feud between Japanese ninja warriors and Samurai warlords. Will Jack and Annie find the tree house again? Or will they be caught up in a terrifying battle?