Gave my mom a copy of Dale Ahlquist's G.K. Chesterton: The Apostle of Common Sense last month. After reading the first 6 chapters, she said to me, "I don't see how anyone could read this book and not become a Catholic."
She was raised Congregationalist. Do not recall her ever going to church. Bought her the book because the day she was released from the hospital after near fatal congestive heart failure, she had a religious experience . She had seen a line from Julian of Norwich in, of all things, a mystery novel. "All shall be well and all manner of things shall be well" stuck with her and during her experience, she knew it was absolutely true. Chesterton, who she heard of but never read, is now filling her in on the faith. Doing a good job of it too. I have Chesterton quoted to me every time I see her. Ahlquist is a good introduction. I tried Orthodoxy first but she had trouble with it until she read Ahlquist. Now she is reading Orthodoxy and wants me to get her Heretics. And of course the Father Brown series. She wants all of those.