More than anything else, I love reading or hearing stories of God showcasing Himself, and that's what the book is. It's about a man, known only as Brother Andrew due to the nature of his work, and how God got ahold of his life and gave him a ministry. He made many trips behind the Communist Iron Curtain to encourage the persecuted church and distribute Bibles. Many pastors and entire churches didn't own even one Bible! The stories are exciting and more incredible than any fiction, and testify to the faithfulness of our God. I was left praising God, as well as burdened to pray for the modern persecuted church.
There's also a "sequel" - the story of Brother Andrew's later work with Muslims, called Secret Believers. That's next on my reading list!