THE GATEWAY OF THE MONSTER by WILLIAM HOPE HODGSON

The Story Summary
In this inaugural Carnacki tale, occult investigator Thomas Carnacki is called to investigate the "Grey Room" in a centuries-old mansion. The room is plagued by a violent, invisible entity that has beaten previous occupants to death.
Unlike traditional ghost hunters, Carnacki uses a blend of ancient ritual and modern technology—specifically his famous "Electric Pentacle." After a terrifying night spent inside the protective barrier, witnessing a massive, disembodied hand attempt to manifest and crush him, Carnacki discovers that the haunting is tied to a historical ring and a "gateway" that was never properly sealed. He...