The first thing that struck me about this book was that it should not be in 'Adventure', but rather in 'Paranormal' or 'Spiritual' with adventure tags, if the author wishes. 

The writing style is splendid, with an exception of a few oddly phrased sentences here and there. I really admired the amount of action and suspense the author added to the prologue itself, which would definitely have readers excited to read the rest of the book. '

I did have a few suggestions, though. The prologue's beginning has a bunch of unnecessary information about the author and random pictures. There should either be a separate chapter for the things in bold, or it should not be there at all. It distracts from the main part, and might even cause readers to skip ahead. 

Another thing I noticed was the constant repetition of 'The man', since it is in third person and the author does not want to reveal the identity of the man. I would suggest switching the prologue to first person, or just giving the man an alias in order to avoid that repetition. 

Overall, good job! 

Final Rating: 7/10