The author introduces actual events and adds a darker, deeper side to an already interesting story.
Whenever you think you might know what is going on, there is a twist. It keeps you guessing what is going to happen next, therefore it slowly absorbs you into the story.
Personally, I like stories like this one, the Da Vinci Code and others like it. I found this one to be particularly good as it is also relatively short. It compacts all the action instead of dragging the story and making it a boring Soap Opera.
I was voluntarily provided this free review copy audiobook by the author, narrator, or publisher.