People want to find out what happens to the characters, and want to keep reading, and turning the pages.
There is a comfort zone of knowing where things are going and having characters in place, but the action gets more and more dramatic and is very challenging to describe.
Fiction has a unique role in conveying Truth. In fact, only fiction that is Truth with a capital T is worthwhile.
Left Behind takes what to some people may be unbelievable predictions from the Bible and shows how they might play out. It makes the events of biblical prophecy understandable and thus believable.
In the prequel we're going to tell about the characters before Left Behind, and the book would end with the rapture instead of start with the rapture like the first one did.
Tim sends me a fairly ambitious workup in notebook form noting the passages we're going to cover and the chronology of the biblical events, and his commentaries on those things he's read and written.
The theater of the mind is impossible to compete with, and I like the idea that with a few suggestions, each reader forms in his or her own mind what a character or a place looks like.
Ironically, in today's marketplace successful nonfiction has to be unbelievable, while successful fiction must be believable.