Rick Deckard (Do Androids Dream of Electric Sheep, by Philip K. Dick)Read about another entry on the list.
Though specifically more a bounty hunter/assassin than a detective, there’s definitely a noir haze around the protagonist of this classic Dick novel (a description that holds true of Harrison Ford’s cinematic interpretation as well). Tracking down and discovering who is a replicant and who isn’t might be Deckard’s job (though in the book he just wants a “real” animal of his own), but the biggest mystery for readers to solve is whether Deckard is human at all.
Do Androids Dream of Electric Sheep? also appears on Weston Williams's list of fifteen classic science fiction books, Allegra Frazier's list of four great dystopian novels that made it to the big screen, Ryan Menezes's list of five movies that improved the book, Amanda Yesilbas and Charlie Jane Anders's list of the twelve most unfaithful movie versions of science fiction and fantasy books, Katharine Trendacosta and Charlie Jane Anders's list of the ten greatest personality tests in sci-fi & fantasy, John Mullan's list of ten of the best titles in the form of questions, Charlie Jane Anders and Michael Ann Dobbs's list of ten classic sci-fi books that were originally considered failures and Robert Collins's top ten list of dystopian novels.