The novel's structure, too, is reminiscent of the 1920s and '30s, when a series of loosely or tightly knot stories published over several issues of Black Mask might later be reissued together as a novel. Frederick Nebel's The Crimes of Richmond City, Paul Cain's superb The Fast One and several of Hammett's own books appeared as serials this way before their publication in book form.
Spade & Archer is presented as three long, linked episodes, set in 1921, 1925 and 1928 (The Maltese Falcon was published in 1929). I don't know if Gores intended this, but it's easy to imagine one is reading three long stories brought together as a novel, in the old Black Mask manner.
(Click here for a thoughtful, highly critical review of the book.)