«The Shadow over Innsmouth» by Howard Lovecraft

The Shadow over Innsmouth is a horror novella by American author H. P. Lovecraft, written in November–December 1931. It forms part of the Cthulhu Mythos, using its motif of a malign undersea civilization, and references several shared elements of the Mythos, including place-names, mythical creatures, and invocations. The Shadow over Innsmouth is the only Lovecraft story which was published in book form during his lifetime.
The narrator is a student conducting an antiquarian tour of New England. He travels through the nearby decrepit seaport of Innsmouth which is suggested as a cheaper and potentially interesting next leg of his journey. There he interacts with strange people and observes disturbing events that ultimately lead to horrifying and personal revelations.
Famous works of the author Howard Phillips Lovecraft: At the Mountains of Madness, The Dreams in the Witch House, The Horror at Red Hook, The Shadow Out of Time, The Shadows over Innsmouth, The Alchemist, Reanimator, Ex Oblivione, Azathoth, The Call of Cthulhu, The Cats of Ulthar, The Dunwich Horror, The Doom that Came to Sarnath, The Festival, The Silver Key, The Other Gods, The Outsider, The Temple, The Picture in the House, The Shunned House, The Terrible Old Man, The Tomb, Dagon, From Beyond, What the Moon Brings.