The book "Mystery in Putnam Hall: The Amazing Discovery of School Friends" was written by the American writer Edward Stratemeyer. This is an adventure book that tells about the exciting adventures of a group of school friends from Putnam Hall. After a chance discovery, they fall into a series of unusual events that force them to solve mysterious mysteries. The author skillfully combines a tense storyline with interesting characters, creating an exciting read for younger readers. "The Mystery in Putnam Hall" is a book that emphasizes the importance of friendship, cooperation and loyalty in solving problems.