I can think of no other reason than this -- Man in White is a historical novel about the apostle Paul. And not only is it a religious novel, but it presents a clear and persuasive argument for conservative (that is, Bible-based) evangelical theology. Indeed, the book is a profound invitation to follow the example of Paul in receiving the forgiveness of sins achieved by Jesus on Calvary's cross and then following the demands of Christ's discipleship, including the passionate preaching of the gospel.
I just finished a second reading of Man in White, originally published in 1986, and I wanted to pass along a most hearty recommendation of it to all of you. Is there some speculation? Of course; it's a novel. But the speculations he does make show a great deal of study of the early 1st Century sources, including a tremendous respect for the original texts of Scripture that he uses.
And, oh yes, the author of Man in White?
It's the entertainer they called The Man in Black...Johnny Cash!