From the introduction:
You escaped the boiler room on the flying city of Cloudship Atlantis. Now in the upper class world of the Gentry you must blend into society, fight Cloud Pirates, conduct duels and avoid the Coppers, who will be hunting you. Born a Humble in the bowels of the great steam giant, you have ascended by luck into the upper world and you must work hard to keep it there.
This book is game setting and system, written in 24 hours. The system is a dice pool system that used d20s.