Robert Donat as a British secret agent is infiltrated into German occupied Czechoslovakia. His mission: destroy a hugh Nazi complex that is manufacturing a deadly poison gas. Disguised as a mmeber of the Romanian Iron guard, he succeeds in dstroying his objective. Valerie Hobson plays a Czech who appears at first to be a Nazi sympathizer but she shows her true alleginces and helps Tatru. One of the best parts of the film is watching a young Glynis Johns. What a beautiful woman and great actress she was! If you like WWII films, this is a must see flick.

During World War II, no one made war movies better than MGM ("Thirty Seconds Over Tokyo", "They Were Expendable", "Purple Heart"--the list goes on and on). Add this British-made spy drama to the roster of solid MGM hits. Robert Donat plays a double agent sent into a Czech war plant to interupt production. Donat's performance is exceptional and young Glynis John shows up as a war-worker. The sets are very elaborate and the 1960s movie "Operation Crossbow" owes a lot to Tartu. Good solid, entertainment.