The Sentinel (1977)
When a beautiful model, Alison Parker, rents an apartment in a gloomy New York brownstone, little does she realize that an unspeakable horror awaits her behind its doors... a mysterious gateway to hell. based on novel or book, italy, secret society, hell, priest, hellgate, lawyer, church, model, demon, police detective, crucifix, brooklyn, new york city, occult, murder investigation, shocking, hopeless, foreboding, frightened, horrified, ominous