From the publisher's website:
Travel beyond the Firewall… to a land of mystery and magic unlike anything else in the fabled lands of Théah.
At long last, the most mysterious of Théah's nations is revealed! For thousands of years, the hidden kingdom of Cathay has remained isolated behind a towering wall of flame. From the golden palace of the Celestial Empress to the fearsome Treasure Fleet that rules the eastern seas, no mystery shall remain hidden to those daring enough to venture forth. Keep your weapons - and your wits - sharp, for the ways of the East are now open!
Comprehensive details on the ancient Imperial Kingdom of Cathay: her past, her people and the astounding beings that claim her as their home.
--Rules for Cathayan characters as well as new magic and fighting schools - suitable for use in Théah or any swashbuckling campaign.
--Adventure hooks, new skills, thorough campaign outlines and more!
--Completely compatible with both the d20 system and 7th Sea's classic roll-and-keep rules.