Valerie Hobson steals the show here in this dark, tense, wartime espionage drama about a German U-boat captain (Conrad Veidt) sent to the Orkney Islands in WWI to gather intelligence on the British Grand Fleet. Released at the start of the Second World War, this first outing for Powell/Pressberger delivers in a much more ominous tone than that of a mere piece of propaganda. There is a depth to the writing and a sinisterness to the story that is gripping for just shy of 90 minutes before culminating in the sort of "gallant" ending that I suspect would not have been considered appropriate five y...