What a treat to discover a terrific movie when you least expect it! This is a highly underrated World War II thriller, starring Paul Massie as a clean-cut, all-American "nice" kid (son of doting Lillian Gish, no less) who is hand-picked by his military superiors to be trained as an assassin. The first twenty minutes is fairly bland and unpromising, but once the locale shifts to Paris, and Massie begins to stalk his assigned victim, "Orders To Kill" becomes a…