Nick and Nora Charles the bantering, romantically involved detective duo has become a well-used trope in literature, stage, screen, and television ever since. The characters first appear in Dashiell Hammett's best-selling last novel "The Thin Man" (1934). Nick is an alcoholic former private detective who retired when he married Nora, a wealthy Nob Hill heiress. Hammett reportedly modeled Nora on his longtime partner Lillian Hellman, and the characters' boozy, flippant dialogue on their relationship. (The novel also mentions that Nick was once a Pinkerton detective, as was Hammett.) The novel is considered one of the seminal texts of the hard-boiled subgenre of mystery novels,
Pinkerton (detective agency) Conan Doyle's Sherlock Holmes novel "The Valley of Fear" (1914–1915). A Pinkerton agent also appears in a small role in "The Adventure of the Red Circle", a 1911 Holmes story. A 1970 film, "The Molly Maguires", was loosely based upon the incident as well. On July 6, 1892, during the Homestead Strike, 300 Pinkerton detectives from New York and Chicago were called in by Carnegie Steel's Henry Clay Frick to protect the Pittsburgh-area mill and strikebreakers. This resulted in a firefight and siege in which 16 men were killed and 23 others were wounded. To restore order, two brigades of