This work investigates the historical presence, expansion, and eventual decline of various Christian communities across the Asian continent prior to the arrival of European colonial powers in 1500. The authors, Hans-Joachim Klimkeit and Ian Gilman, utilize a combination of archaeological findings, linguistic analysis of ancient manuscripts, and historical records to reconstruct the lives of these often-overlooked believers. By examining the Nestorian, Melkite, and other traditions, the text argues that Christianity was a significant, albeit minority, religious force in Central, East, and South Asia for over a millennium. The framework focuses on the cultural adaptation of these communities within diverse political environments ranging from the Silk Road to the Mongol Empire.

Scholars and historians frequently cite this text as a foundational resource for understanding the non-Western history of Christianity. Readers often note the academic density of the prose, which provides a comprehensive overview of a complex and geographically dispersed subject matter.