First released in U.S. cinemas nearly 50 years ago, William Friedkins' adaptation of William Peter Blattys' bestselling novel remains one of the most powerful and thought provoking films ever made.

‘The Exorcist’ tells the story of the demonic possession of twelve year old Regan MacNeil (Linda Blair).

Opening, with scenes of an archaeological dig in northern Iraq, Father Lankester Merrin (Max von Sydow) finds an amulet resembling the statue of Pazuzu, a demon he had defeated years earlier, Merrin realises the demon has returned to seek revenge.

The scene quickly shifts to Georgetown, where single parent Chris MacNeil (Ellen Burstyn) is balancing a busy acting career with bringing up her daughter Regan. We are also introduced to Father Damien Karras (Jason Miller), a young priest who is struggling with doubts about his faith.

One night, after playing with a Ouija board, Regans behaviour suddenly changes. From an initial strangeness, it soon escalates into something far more violent and disturbing. Having exhausted all medical avenues, Chris MacNeil turns in desperation, to the Catholic church. Confiding in Karras that she believes her daughter is responsible for the death of her friend and film director, Burke Dennings (Jack MacGowran), he agrees to help.

With the churches' blessing, the exorcism will be performed by Father Merrin, with Father Karras assisting. Arriving at the house, Merrin is left in no doubt he is there to do final battle with Pazuzu.

With the exception of veteran actors, von Sydow and Lee J. Cobb as investigating police detective, Lieutenant William F. Kinderman, the cast were, at the time, relatively unknown and the film has several notable performances. From Ellen Burstyns increasingly distraught mother to Jason Millers priest, burdened with anguish by his loss of faith and guilt over the circumstances of his mothers passing to Linda Blairs remarkable portrayal of Regan.

Despite scenes and dialogue that are still shocking today, 'The Exorcist' has a deeply moral message. Good can triumph over evil, even if it sometimes comes at a terrible price.

Not just one of the best horror films ever made, Friedkin’s film is a cinematic masterpiece.