The Troubletwisters series does not have a new book coming out soon. The latest book, The Missing (Book 4), was published in May 2014.
The first book in the Troubletwisters series, Troubletwisters, was published in May 2011.
The Troubletwisters series primarily falls into the Action Adventure and Fantasy genres. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.