Here is an early chapter book series about a magical, book-filled house that transports two children back in time. The tree house is back — but where is the enchantress Morgan le Fay? The search for her begins as Jack and Annie are transported back to ancient Japan. Don't forget your kusarigama! Did you ever take tea with a real live Ninja? Jack and Annie do. They find themselves in the cave of a Ninja master. Will they learn the secrets of the noble and mysterious Ninja? Or will they perish under the fiendish swords of the cynical and mercenary samurai warrior caste?