Interesting steampunk fantasy set in a three layered world. Rogues and other misfits live underground beneath the normal world while the secretive court of the air flies overhead. The court watches over all and pulls strings behind the scenes to keep their territory in good shape.
Hunt's steampunk writing probably sits about half way between the lightweight Neil Gaiman and the morbidly heavyweight work of Mieville. All in all its not a bad compromise. Entertaining.