The House War, book 3: House nameMichelle West2011

The House War series centers on the most popular character in The Sun Sword series: a young woman named Jewel, who survives both the everyday perils of being an orphan in the slums of the city of Averalaan, and the demonic dangers of the Undercity, and who rises to become a key figure in House Terafin, the most important of the Ten Houses of the Essalieyan Empire. At the close of The Sun Sword series, the House War is about to begin. Now, at last, that story can be told.