The narrative follows an unnamed narrator who recounts his harrowing experience at sea during World War I. After his ship is attacked and sunk by a German submarine, the narrator finds himself adrift in the ocean. He eventually comes upon a strange, unearthly island covered in slimy mud and the remnants of ancient, non-human architecture.
As the narrator explores the island, he discovers an ancient idol of a sea creature called Dagon. Overwhelmed by the horror of his surroundings and the presence of this ancient deity, the narrator is driven to the brink of madness. He contemplates the terrifying implications of encountering such an ancient and unfathomable creature.
"Dagon" explores themes of cosmic horror, the insignificance of humanity, and the fear of the unknown. It touches upon Lovecraft's recurring theme of ancient, god-like entities that lie dormant or hidden beneath the Earth's surface, waiting to be rediscovered and bring terror to humanity.
Lovecraft's writing in "Dagon" showcases his talent for creating an atmosphere of dread and hopelessness. The story's imagery and descriptions evoke a sense of profound terror and the realization that humanity is dwarfed by the vastness and age of the cosmos.
While "Dagon" is a relatively brief work, it serves as a precursor to Lovecraft's later mythos, setting the stage for his exploration of ancient cosmic entities, forbidden knowledge, and the fragility of the human mind in the face of the unknown.