Priest-Workman in Germany is Henri Perrin's true story of his experiences as a Catholic priest disguised as a factory worker in Germany during World War II to observe the spiritual and social conditions of the workers, an in-depth account of the life of the German working class, marked by propaganda and struggles for faith, that became a landmark work on workers' theology and the challenges of faith in an industrialized society. The book is a valuable historical and theological witness, showing how faith was tested and lived out in the harsh realities of everyday life, and laid the foundation for the later development of workers' theology.