An overnight success years in the making, Armin Mueller-Stahl spent the post-World War II era in East Berlin studying and playing the violin. The former music teacher made his stage acting debut at the Theater am Schiffbauerdamm (home of the famous Berliner Ensemble) in 1953 and worked for more than two decades with another noted East Berlin company, Volksbuehne (People's Stage). After making a smooth transition from stage to screen in "Heimleche Ehe/The Secret Marriage" (1958), he became one of DEFA's (the state-run film conglomerate) outstanding young actors. His three-picture collaboration