The Wurmbrand Letters, by Richard Wurmbrand, is a 157 page book of letters written to church leaders about Christians suffering in prison.
The Torchlighters: The Martin Luther Story
The Torchlighters: The Adoniram and Ann Judson Story
The Witnesses Trilogy: God With Us
Allah Is He God?
The Oracles of God
The Torchlighters: The Gladys Ayward Story