The Return of the Sentinels is the third book in The Order of the Sentinels tetralogy, The Eidolon Series. This book begins with the Deployment of Sentinels Ruben, Joe, and George in Ruben’s new timeline to Mokiem, where they will combine forces with the Mokaijem in their fight against The Collective. The start of this book takes place on Earth decades after Ruben "died" at the Battle of Kassam Pass, though on Mokiem only a week has passed since the initial battle.

This novel encompasses a wide variety of genres, to include Sci-fi/Fantasy, time-travel, action adventures on multiple worlds (primarily on Earth and Mokiem), and is replete with magic, mystery, and romance. For most ages: teens and adults.