In an old private chapel attached to a country house, a trusted servant keeps night watch beside the ancient altar, alone behind a locked door. By morning he is found dead, a dagger from the chapel’s peculiar mechanism driven clean through his heart—though no human hand should have been able to strike the blow. No tracks, no witnesses, only the oppressive sense that something in that dim, little sanctuary has moved unseen. As Thomas Carnacki retraces the dead man’s final hours and tests the chapel’s sinister contrivance for himself, the silence around the altar begins to sound like an answer of its own.

First published in the 1909 collection The Ghost Pirates, A Chaunty, and Another Story, “The Thing Invisible” later appeared in The New Magazine (January 1912) before being collected in Carnacki, the Ghost-Finder (1913). The story is in the public domain.

William Hope Hodgson (1877–1918) was an English writer of sea stories, supernatural fiction, and weird horror. He is best known for his visionary novels The House on the Borderland and The Night Land, as well as his stories featuring the occult detective Carnacki.

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