The novel is a psychological exploration of the mind of a man living in isolation on an island in the Baltic Sea. The protagonist, a fisheries inspector, is intellectually superior to the local population and struggles to maintain his sanity amidst the ignorance and superstition of the islanders. His mental state deteriorates as he becomes obsessed with the idea of a sea monster lurking in the depths, symbolizing his own repressed desires and fears. The story is a deep dive into the human psyche and the effects of alienation, paranoia, and existential dread.

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