The Terrible Old Man by H. P. Lovecraft

In a shabby New England harbor town, a mysterious, solitary old sailor—feared for his odd habits and whispered to guard a hoard of silver—draws the attention of a trio of would-be thieves whose plan to rob him ends in horror; the intruders are met not by a helpless recluse but by uncanny, sea-touched abilities and an implacable, ancient will that dispatches them and leaves the neighborhood to brood on the terrible price of meddling with forces it neither understands nor dares to name.

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