Dear Kenneth,

I haven't read his book, so I can't comment directly, but a good insight into the subject matter can be found in an interview with Fr. Chad Ripperger:

• A Well-Known Exorcist Talks Ghosts, UFOs, Vampires and Video Games.
  

I would listen to him on any subject related to the occult, supernatural, preternatural or any fantastic event(s) or experience(s).

Peace,