The Fallen Isles series does not have a new book coming out soon. The latest book, When She Reigns (Book 3), was published in September 2019.
The first book in the Fallen Isles series, Before She Ignites, was published in September 2017.
The Fallen Isles series primarily falls into the Speculative Fiction genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.