There are 3 books in The Harper Hall Trilogy series.
The Harper Hall Trilogy series does not have a new book coming out soon. The latest book, Dragondrums (Book 3), was published in March 1979.
The first book in The Harper Hall Trilogy series, Dragonsong, was published in March 1976.
The Harper Hall Trilogy series primarily falls into the Science Fiction genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.