The Unstoppable series does not have a new book coming out soon. The latest book, Promises Stronger Than Darkness (Book 3), was published in April 2023.
The first book in the Unstoppable series, Victories Greater Than Death, was published in April 2021.
The Unstoppable series primarily falls into the Space Opera and Science Fiction genres. This young adult series was written for ages 12-17, but can be enjoyed by adults too.