Valley of Eagles

Valley of Eagles US release title Valley of the Eagles is a 1951 British thriller film written and directed by Terence Young and starring Jack Warner, Nadia Gray and John McCallum. A Swedish scientists crucial new invention is stolen by his wife who tries to take it to the Soviet Union.

Returning home from Uppsala, Ahlen finds his apartment disturbed and his wife and the key to his laboratory both missing. A search of the lab reveals that the vital components of the recorder have been stolen. He alerts the police and the head of his institute, and an investigation begins. Ahlen, however, soon becomes impatient with the attitude of police inspector Peterson and, having established that his assistant Nystom is also missing, begins an investigation of his own. This takes him to a rendezvous with a mysterious baroness in Karlstad, with whom Nystrom has been in correspondence. The baroness denies all knowledge of Nystrom, although she answers to the description of a frequent visitor that Nystrom has had. As Ahlen is leaving her house, the baroness manservant tells her she has a call from Leksand.Peterson has also traced the trail to the baroness, and meets up with Ahlen in his car. The two agree to work together. They find out that a plane has been forced to make a landing at Leksand and that Nystrom and Helga were on board. The pair are obviously heading north for the border with Finland in Swedish Lapland, presumably to take the invention to the Soviet Union, although this is never made explicit. From now on, the action switches between Ahlen and Peterson and Nystrom and Helga in their race for the border. When a blizzard begins, Ahlen remarks that the weather is visited on the just and unjust alike and then wonders which of them is which. ........

Source: Wikipedia