Early in the twentieth century a new character type emerged in the crime novels of American writers such as Dashiell Hammett and Raymond Chandler: the "hard-boiled" detective, most famously exemplified by Sam Spade in The Maltese Falcon. Unlike the analytical detectives of nineteenth-century fiction, such as Edgar Allan Poe's Inspector Dupin, the new detectives encountered cases not as intricate logical puzzles but as stark challenges of...