It is a film that embodies the story of philosophical lieutenant William F. Kenderman. This man began to discover more than he negotiated his investigation into a series of strange daily murders. These crimes bear all the hallmarks of 'The Gemini', a serial killer who apparently died long ago.
A good chunk of The Exorcist III is taken up by a series of sit-down chats; close-ups of Scott's ugly mug are the only half-frightening thing on the screen.
Written and directed by William Peter Blatty, author of the original Exorcist. So, while it's not quite as chilling as the first story, It is at least a quality sequel