The Shadow over Innsmouth is a horror novella by H. P. Lovecraft, written in November-December 1931. It forms part of the Cthulhu Mythos, using its motif of a malign undersea civilization. It references several shared elements of the Mythos, including place-names, mythical creatures and invocations. The narrator is a student on an antiquarian tour of New England. He sees a piece of exotic jewelry in a museum, and learns that its source is the nearby decrepit seaport of Innsmouth. He travels to Innsmouth and observes disturbing events and people.