Stewart gives a masterful portrayal of a simple but brilliant inventor, Marsh Williams, who is sent to prison for thirty years after his still is raided and a revenue agent is killed by one of Stewart's associates. At the North Carolina prison farm where Stewart is sent, hardships and
brutality abound, and Stewart at first struggles against the quiet authority of warden Corey. To occupy his time, Stewart secretly begins to construct a weapon, not one with which to escape, but an entirely new invention. Having a lifelong fascination with firearms, Stewart conceives a weapon with
a short-stroke piston. When Corey discovers the weapon and confiscates it, Stewart goes ...