Ninja at night. Magic treehouse-5

This is the fifth book in the series "Magic House on a tree".
Once in the summer in the forests surrounding the town of Frog-Crick, in the state of Pennsylvania, a mysterious house on a tree appeared.
He was found Jack, who is eight years old, and his seven -year -old sister Annie. The children climbed into the house and saw that he was full of books.
Very soon, Jack and Annie learned that the house was not simple, but magical. The house was able to transfer people to books. To do this, it was necessary to just point a finger at the picture and say: "I want to go there."
Jack and Annie visited the era of dinosaurs, in old England, in ancient Egypt and on a pirate ship.
And they also found that the mistress of the house was Morgana Le Fay, a sorceress and a collector of books. Morgan was born during the time of King Arthur. She traveled through time and space and gathered books everywhere.
And now Jack and Annie have a new journey and acquaintance ... from the ninja in the night.
The series "Magic House on a tree" celebrates his 25th anniversary in 2017.
Books "Magic House on a tree" were recognized in the world and became a modern classic of children"s reading for adventure (the child is breathtaking) and for very correctly (from the psychology of the child) selected facts about certain historical periods.
It is considered an ideal series for the first independent reading of younger students. Properly selected phrases, short paragraphs, dialogs, large letters, adventure, illustrations and - the desire to find out what will be next to it. So it reads to the end. Myself. Moreover, the book is not thick.
In 2006, a series of books "Magic House on a tree" surpassed Harry Potter in popularity and took first place in the list of bestsellers "New York Times".
Books are translated into 20 languages.
53 million copies were sold