There are 3 books in the Otherworld Chronicles series.
The Otherworld Chronicles series does not have a new book coming out soon. The latest book, The Dragon King (Book 3), was published in January 2014.
The first book in the Otherworld Chronicles series, The Invisible Tower, was published in January 2012.
The Otherworld Chronicles series primarily falls into the Fantasy genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.