In the Mouth of Madness (1995)
In the Mouth of Madness (also known as John Carpenter's In the Mouth of Madness) is a 1995 American Lovecraftian horror film directed and scored by John Carpenter and written by Michael De Luca. It stars Sam Neill, Julie Carmen, Jürgen Prochnow, David Warner and Charlton Heston. The film is the third installment in what Carpenter calls his Apocalypse Trilogy, preceded by The Thing and Prince of Darkness.
More at Wikipedia.