These Are Also Your Brothers, by Richard Wurmbrand, is a 140 page book telling the stories of Christians in the underground church all over the world.
Six Busy Days
Sermons from Solitary Confinement
The Torchlighters: The John Bunyan Story
The Torchlighters: The Perpetua Story
Share Their Voice: Shafia's Story
The Torchlighters: The Samuel Morris Story