The last time I was so creeped out reading a book, it was Stephen King's 'Pet Sematary'. This one by Dean Koontz made my skin crawl with its lurid descriptions. Yet I was gripped, enthralled by the macabre buffet of words, insatiated through morbid curiosity. As for the story, it ends in such a way that I would term as 'a twist to the pre-tribulation rapture'. Note: It's probably 'tame' by others' standard, but I don't have a strong stomach for anything creepy and scary.