What is the most compelling, captivating, and impossible-to-put-down book you’ve ever read?

I started reading this book early in the evening:

Bare-faced Messiah

I did not put it down until 10 am the following morning. I did not sleep; I just kept reading and reading. The narrative it presented, of L Ron sinking into his own mythos on board a Sea Org cruise ship meandering through the Mediterranean, was devastatingly enthralling.