This is the first book of a new genre, Gaspunk, stories that are set in a 6th century Roman Empire that has airships and other advances in technology. This series, The Roman Sky, is about Cillian, a Roman soldier from a Gael-Goth family who seeks his destiny on the airships of an Airborne Legion. This story, Empire's Gate, follows Cillian as he joins the Airborne, fights his first battles, and learns that enemy airships and armies are not the only threat he faces.