Paris, 2017: Ottoman flags have been flying over the great city for 300 years, ever since its fall -- along with all of Europe -- to the empire's all-conquering army. Notre Dame has been renamed the Fatih Mosque. Public spaces are segregated by gender. And Kamal Arslan Agha, a feted officer in the sultan's secret police, is starting to question his orders. Rumours of an impending war with the Christian Republic of America, attacks by violent extremists, and economic collapse have heightened surveillance and arrests across the empire.