Beverly Hills, CA: Metro-Goldwyn-Mayer [MGM], 1935. Dashiell Hammett's original submitted Treatment script for the first sequel to "The Thin Man," here referred to only as "Thin Man Sequel," and ultimately titled "After the Thin Man." With a single manuscript correction by Hammett, and letter of provenance from Hammett's daughter Josephine Hammett Marshall regarding the discovery of the treatment in the family's estate. The first "Thin Man" film, released in 1934 and based on Hammett's novel, was a smash hit and is today a key film in the American screwball comedy cycle. Five sequels were made between 1936 and 1947 (all starring the original acting team of William Powell and Myrna Loy), and this previously unknown attempt at a sequel by Hammett was clearly commissioned by MGM but never produced, making this script an entire unpublished Hammett work. The story is a completely original one, never reworked for the other films, very much written in Hammett's trademark style and…