The #1 bestselling chapter book series is now available as graphic novels! Magic. Mystery. Time-travel. Get whisked away to ancient Japan and the time of ninjas with Jack and Annie! There's a whisper in the shadows, a silent warrior. It's a ninja! The magic tree house has whisked Jack and Annie to ancient Japan. They need to learn the secrets of the ninja in order to help their friend Morgan! But how do you find a warrior that hides in the shadows? You don't find a ninja . . . the ninja finds YOU!