Along the Hudson River, about an hour north of New York, is a church perched atop a hill in a village called Sleepy Hollow. When Washington Irving immortalized the Old Dutch Church with its Headless Horseman in “The Legend of Sleepy Hollow,” it became a literary mainstay. For 300 years, the ghost who haunts the churchyard has frightened people. These days, a new force distresses the locals.

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