Reconstitution of the alleged true story about demonic possession that was behind William Friedkin's The Exorcist. Reconstitution of the alleged true story about demonic possession that was behind William Friedkin's The Exorcist. Reconstitution of the alleged true story about demonic possession that was behind William Friedkin's The Exorcist. Reconstitution of the alleged true story about demonic possession that was behind William Friedkin's The Exorcist.