Desc: The Fighting Sap: Directed by Albert S. Rogell. With Fred Thomson, Hazel Keener, Wilfred Lucas, George B. Williams. Charles Richmond, wealthy mine owner, closes his door to his son, Craig, because he wants to give him a taste of the world. Craig, a geologist, goes to a mine considered worthless by his father, to study rock specimens there. At the mine he learns that a gang of ex-convicts are in the employ of Walter Stoddard, friend of his father, whom the elder Richmond considers insane. Several attempts are made to murder Craig but he thwarts the bandits, even in their attempt to suffocate Richmond and his daughter in the gold vault. The senior Richmond appears just as his son is cleaning house, and, in time to welcome Miss Stoddard as a future daughter-in-law.