The Whisperer in Darkness

H. P. Lovecraft wrote the short story "The Whisperer in Darkness between February and September 1930 and first appeared in Weird Tales in August 1931.
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It is a horror/science fiction hybrid, similar to "The Color Out of Space" (1927). Despite numerous references to the Cthulhu Mythos, the supernatural does not play many roles in the plot; although the Mi-Go, an alien race who thrive on technology that is a mix of science and mythos, debut in this story.
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Much to the chagrin of Albert N. Wilmarth, local academic, bizzare things are sighted floating in rivers in the area of rural Vermont after a flood which reignites debates regarding an old myth of hill-dwelling monsters that abduct humans. However, Wilmarth is drawn into a surprising correspondence that leads to a troubling discovery when he begins receiving letters from an individual named Henry Wentworth Akeley which talks about the alleged presence close to his farmhouse of an extraterrestrial race worshipping ancient cosmic deities.