It was an Italian and Yugoslavian co-production directed by Alberto Lattuada, starring Suzy Kendall and Kenneth More, and featuring Capucine, James Booth, Giancarlo Giannini and Nigel Green.

A woman spy and some male agents working for the Germans during World War I land at night near the Royal Navy base at Scapa Flow, from a U-boat.

She then helps a German U-boat to sink HMS Hampshire outside Scapa Flow with Kitchener on it, taking his life.

The German military intelligence service and its head, Col. Walter Nicolai, are suspicious of Meyer's escape from the British, but use him to poison Fräulein Doktor because of her addiction to morphine.

However, Fräulein Doktor's death was faked for Meyer's benefit so she would be free of suspicion for her next assignment, getting Allied defense plans for a German attack in Belgium.

[1][2] Suzy Kendall was a casting choice reflecting Virginia McKenna's portrayal of the French-born Violette Szabo in the 1958 WW2 action drama Carve Her Name with Pride.