William Friedkin started his career doing documentaries for television back in the ’60s (which helped inform the style of The French Connection), but he hasn’t really returned to non-fiction in any significant way since then. This year, however, he has an intriguing new documentary on the way that should make a very cool companion piece to The Exorcist. The movie is called The Devil and Father Amorth and it finds him following the work of Father Gabrielle Amorth, a man who has served as the head Exorcist for the Diocese of Rome for over 30 years. Whether you believe in this stuff or not, it looks like a creepy and intense experience and one that is all too real for some people. The Devil and Father Amorth hits select theatres on April 20th; check out the trailer after the jump and see what you think.