The Rats in the Walls. H. P. Lovecraft

When an American man discovers that he's the last descendant of the De la Poer family, he travels to England to take over their crumbling estate. Accompanied only by his cat, the man follows the incessant sound of rats to a dark place beneath the estate, unearthing horrible, dark, gruesome secrets about his ancestors and the type of activities they partook in. Taken by madness, the man falls into a dark pit of despair and commits unthinkable crimes. This jarring story from a renowned writer of horror fiction utilizes fear-inducing themes to entice its audience.