Ryan brings us the "confessions" of Henry and Ottis. They are or can be the most prolific mass murderers in the history of the US if not the world. These two traveled the country separately and collectively killing as they pleased for their own pleasure or possibly for demonic purposes, so Ottis claimed.
Of course, murder is not to be taken lightly, but the how that Henry and Ottis came to be, is very difficult to get through when reading at the start. I am not going to say that the tale that Ryan brings us gets easier to take in, but I think it is especially difficult to learn how some people treated their own children to shape such horrific future for them and the world at large.
While it is easy to skower the internet for information about these two and their crimes, Ryan does a great job of bringing us not only their confessions, but insight as to how they came to be. Essentially these two men should be the antagonists, they become both, the protagonist as children or interactions with family and the antagonist to the rest of the world.
While I have come across Henry and Ottis, I did forget that Ottis was the man who took short the life of America's Most Wanted host, John Walsh's son, Adam.