The Henry Hunter series does not have a new book coming out soon. The latest book, Henry Hunter and the Cursed Pirates (Book 2), was published in March 2017.
The first book in the Henry Hunter series, Henry Hunter and the Beast of Snagov, was published in September 2016.
The Henry Hunter series primarily falls into the Action Adventure genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.