I second the opinion on Martin’s book, although it scared the crap out of me. But don’t dwell too much on this subject. It’s not wise.
Agreed - “Hostage To The Devil” by Fr. Martin is an excellent book; also M. Scott Peck wrote “Glimpses of the Devil,” which is informative reading. Best to keep your mind focused on the good which God keeps you - always protect your mind from evil temptation and influences of the Devil!