High Tide in Hawaii (Magic Tree House #28) by Mary Pope Osborne
Jack and Annie are ready for their next adventure in the bestselling middle-grade series-the Magic Tree House!
Catch the wave!
That's what Jack and Annie do when the Magic Tree House whisks them back to a Hawaiian island of long ago. They learn how to surf and have a great time-until strange things start happening. Jack and Annie soon discover the cause- A tidal wave is headed their way! Can they help save their new friends in time?