You might like a couple of Michael O'Brien's novels... sandyeggo and I loved "Fr. Elijah" and I am almost done with the children of the last days trilogy 1. Strangers and Sojourners 2. Plague Journal 3. Eclipse of the Sun. You could probably skip the first two and read the third independantly - the third is the best one, imo. Anyhow, all of them are apocolyptic in nature, very well written and suspenseful.
Thank you for the book titles. I haven't read those but I sure will! I love to read those kinds of books. I was just cleaning out some of my book shelves today as I am getting ready to move and found some I hadn't read in years. They are in the pile to be reread!