The Third Policeman, is a novel that blends absurdity, dark humour, and philosophical inquiry. Originally completed in 1940, it was published posthumously in 1967. This novel is a significant contribution to mid-20th-century literature and is especially notable for its surreal and imaginative narrative, making it a key work in the canon of absurd and postmodern literature.

The story is narrated by an unnamed protagonist who finds himself embroiled in a bizarre world after committing a murder to fund his scholarly work on the eccentric philosopher de Selby. The narrative takes a surreal turn when the protagonist enters a police station and encounters a peculiar, often illogical world governed by obscure laws and inhabited by enigmatic policemen.

One of the most striking aspects of The Third Policeman is O Brien's use of absurd and surreal elements to explore themes such as existence, identity, and the nature of reality. The novel is infused with a unique blend of comedy and horror, creating an unsettling yet captivating atmosphere. The narrative is laced with references to and discussions about the fictional philosopher de Selby, whose bizarre theories add layers of complexity and humor to the story.

The book's structure defies conventional plot development, instead revolving around cyclical and recursive motifs. This approach challenges traditional notions of time and space, further enhancing the novel's surreal quality. The Third Policeman is a testament to O Brien's ingenuity and creativity as a writer. Its blend of absurdity, philosophical depth, and dark humour marks it as a distinctive and enduring work in the landscape of modern literature.