I bought this movie because it was directed by Michael Powell, scripted by Powell and Emeric Pressburger, and starred Conrad Veidt and Valerie Hobson (a great important British director/producer/writer and two great stars). I knew this hailed from just before Powell & Pressburger hit their stride as THE ARCHERS. Boy, what a pleasant surprise; this is FIRST-RATE suspense/spy thriller which takes place in the early days of wartime Britian but before Pearl Harbor. It's about a Danish sea captain who's forced to follow two missing and suspicious passengers while his ship is being temporarily held by the British. What follows is a spy mystery through London during the days of Blackouts....and is ever bit as clever, amusing and suspenseful as any of Hitchcock's superb British sound films. I URGE you to check out this great and little seen British film classic.