I just read this book recently, and though it was written in the late sixties, its message is still stirring. Haralan, a pastor in Bulgaria, was taken from his home in the middle of the night and taken to jail. He recounts many of the horrors of the brainwashing process, sleep deprivation, starvation, and imprisonments during the Communist regime. He continued to find opportunities to talk to other prisoners about God's work of salvation. Haralan comes across as a humble man, serving God in each circumstance with grace for each day delivered by the God he served and worshipped. This account is very moving, and I would encourage you to read it for yourself. You will appreciate the freedom you take for granted. I was deeply moved and convicted.