By the early twentieth century, there were close to two hundred American missionaries working in the Middle East and Eastern Europe. They came in droves as early as 1830, organizing hundreds of schools, hospitals, printing presses, and seminaries. Until now, the missionaries' sources and perspectives have dominated discussions of this moment in history, but the experiences of the Ottoman authorities are just as, if not more, revealing of an increasingly tense relationship between Christianity and Islam. An enthralling narrative of how locals made sense of American religious activity in the Ottoman Empire, Faithful Encounters examines the relationships between the authorities who managed the empire from the capital city of Istanbul, provincial agents who carried out the capital's orders, and the missionaries who engaged with them. Exploring a wide range of untapped sources – from imperial ministries, security forces, and local petitions to international reports and missionary collections – Emrah Sahin traces the interactions of the Ottoman authorities, focusing on the viewpoints and manoeuvres they adopted to monitor and conquer the missionary presence at a time of turbulent public and political upheaval. Offering a comparative context from which to reconsider recent cultural relations in the region, Faithful Encounters is not only a history of Christian and Muslim relations. It is a lesson about a failing mission in a failing empire, with stunning relevance to the looming religious and ethnic crises of today.