It is the Magic Tree House 41th book.
The very last Magic Tree House book in the series is "Hurricane Heroes in Texas" which is book number 135.
The 3rd book in the Magic Tree House series is "Magic Tree House #3: Mummies in the Morning".
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 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".
Magic Tree House #48 Saturday in a Snowstorm Magic Tree House #49 Midday in a Mayan Kingdom Magic Tree House #50 Autumn in Ancient Egypt Magic Tree House #51 August in Arabia Magic Tree House #52 Riding Chariots in Rome
Yes there is. It is calledQueen of The Nile at Noon.Check on Wikipedia under Mary Pope Osborne. Click on Magic Tree House Series. Scroll down to Magic Tree House Merlin Missions then it is the last one on the list.
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.
Book number 40 of the Magic Tree House series was published on September 23, 2008. Book number 41 was published on March 10, 2009. Book number 42 was published on Jul 28, 2009. Book number 43 was published on January 12, 2010.
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).
Yes, there is a book 46 in the Magic Tree House it's name is Dogs In The Dead Of Night.