The Answer to the Atheist's Handbook, by Richard Wurmbrand, is a 192 page book conceived while in solitary confinement, where the author presents his case for belief in God.
Preparing for the Underground Church
The Witnesses Trilogy: God With Us
Praying for God
The Torchlighters: The John Bunyan Story
Sermons in Solitary Confinement
The Torchlighters: The Corrie Ten Boom Story