I had won this through one of the giveaways on Goodreads... I was hesitant to read this at first, thinking it was going to be more of a non-fiction read full of conspiracy theories, which would ultimately freak me out... However, this was not the case! 12.21 is told through multiple characters, with the plot unfolding as the story goes on... I found myself reading a majority of the book in one sitting because I couldn't put it down... This book is full of interesting details from different standpoints- medical and historical... Overall, it was a very interesting read!