Sermons in Solitary Confinement, by Richard Wurmbrand, a 188 page book is the author's story of three years in solitary confinement, thirty feet below ground and the torture he suffered.
All the Paths of the Lord are Mercy and Truth
The Torchlighters: The Perpetua Story
Where Christ is Still Tortured
Preparing for the Underground Church
Underground Saints
With a Dynamic Man of God