For the leftovers, tribulation starts after the departure, on October 14th, a weird fall.
I was intrigued by the TV show. The theme is really novel, and I tried to keep up with the TV show, but find it hard because of its slow pace and seemingly lacking of answers. Then I came across the book, which is great in lots of ways. It gave me the ability to finish it in one sitting, allowed me to grasp the whole picture. ps it's interesting.