March 10,2009
Book #41 of the Magic Tree House series is called "Moonlight on the Magic Flute" and is scheduled for release on March 24, 2009.
It's Magic of the Moonlight its a GREAT book
It is the Magic Tree House 41th book.
The 20th book in the Magic Tree House series is Dingoes at Dinnertime.
The highest magic tree house book is Book # 55, "Night of the Ninth Dragon."
The 3rd book in the Magic Tree House series is "Magic Tree House #3: Mummies in the Morning".
Book 47 is called Abe Lincoln at Last. It is the third book in the series that Jack and Annie find the solution to Penny, a penguin that was turned to stone. It is scheduled to be published in the winter of 2012.
The 44th Magic Tree House book is A Ghost Tale for Christmas Time and it was published in 2010.
Magic Tree House book #39 is called "Dark Day in the Deep Sea".
The very last Magic Tree House book in the series is "Hurricane Heroes in Texas" which is book number 135.
It is a book that has a brother and sister travel to different times via Morgan Le Fay's magic tree house (morgan is not evil in this book).
The newest Magic Tree House Book is Dogs In The Dead Of Night which is coming out in August 2011.---- As of for June 2011 the day I am writing this answer, the newest Magic Tree House book is book #45-A Crazy Day With Cobras.