In the Mouth of Madness
1994
Insurance investigator John Trent searches for a missing horror novelist whose books seem to warp the minds of readers. His investigation leads him toward a town that should exist only in fiction, where the boundary between invented nightmares and reality begins to collapse around him.
Why it fitsMay contain spoilers
Cane's fiction becomes reality under the influence of monstrous powers beyond human comprehension, culminating in the revelation that Trent's reality and agency are themselves unstable.