The Haunter of the Ring

"The Haunter of the Ring" is a 1934 short story by Robert E. Howard, belonging to the Cthulhu Mythos. It was first published in the pulp magazine Weird Tales in the June 1934 issue.
This story is set in the modern age but includes a relic from the Hyborian Age of the Conan the Barbarian stories, the ring of Thoth-Amon.