Originally Posted by GA Russell
Did you know that Hammett wrote four Sam Spade short stories? They are collected together with other Hammett works in a book entitled The Adventures of Sam Spade.
There was also a long-running radio serial (in the US) along the same lines. It was extremely popular for a while, until Hammett was replaced as the writer (possibly because of his political activities and subsequent imprisonment and investigation by HUAC - I'm not sure about any of that; I think I read it somewhere).