Many see William Peter Blatty's The Exocist III as the true heir to the classic horror DVD movie The Exorcist. Perhaps this is because Blatty, author of the original novel, adapted and directed his own follow-up novel Legion into The Exorcist III. Though some horror fans were disappointed by this one (though much less than they were with the rather awful Exorcist II The Heretic), this movie, which is at first more a mystery with a supernatural twist than a horror movie, is excellent.
The Exorcist III picks up on the friendship between Detective William F. Kinderman (another superb turn by George C. Scott) and Father Dyer (played this time around by Ed Flanders). It seems Kinderman has finally found a friend to go to the movies with until the friend, Father Dyer, is killed in his hospital bed. This is the third killing that copycats those of the Gemini Killer some fifteen years ago and since the Gemini killer was executed on the electric chair Kinderman is baffled.
Kinderman figures out all three victims are somehow connected to the events surrounding the possession and exorcism of Regan MacNeil. Things get really weird when Kinderman discovers one of the patients in the isolation ward is Father Damien Karras who assisted in Regan's exorcism, threw himself out her window, and died at the bottom of a long flight of stairs under Kinderman's very eyes. The long dead Karras claims to be the long dead Gemini killer and can even morph into him and actor Brad Dourif (Lord of the Rings, Child's Play). This is where The Exorcist III becomes a bit more a horror DVD than a mystery.
In the end, The Exorcist III is not bad at all though I would love to see Kinderman explain his actions to Internal Affairs.
The Exorcist III, part of The Exorcist The Complete Anthology box set released by Warner Home video, features a lot of cameos such as Fabio as an angel of sorts in Kinderman's dreams. Colleen Dewhurst is the voice of evil in this one.