Missionaries in north-eastern China are still engaged in the dangerous work of spreading the Gospel across the border to North Korea, even though at least ten missionaries and pastors have mysteriously died in recent years. They keep at it because they believe their converts will help change religious practice in the cloistered North, which equates Christianity with US-led Western imperialism. The border missionaries provide their North Korean visitors with room and board, and those escaping with places to hide. In return, they ask them to memorise Christian prayers and covertly share what they've learned when they return home.