In the Mouth of Madness (1994)

With the disappearance of hack horror writer Sutter Cane, all Hell is breaking loose...literally! Author Cane, it seems, has a knack for description that really brings his evil creepy-crawlies to life. Insurance investigator John Trent is sent to investigate Cane's mysterious vanishing act and ends up in the sleepy little East Coast town of Hobb's End.