This set of books is very entertaining and at the same time very informative. It is true we cannot get doctrine from a educational fiction book but this does help you visualize some of the times prophesied in the Bible that we see coming.
The book is very well written and does give some doctrinal examples where the storyline is coming from biblically.
I also like the idea that it’s not in your face Christ or nothing and shows that even if you missed the rapture all is not lost you can still be saved you’ll just have the tribulation to go through.
Start reading and you’ll not be sorry you did. Cheers