U-67
AKA The Sea Ghost Greg Winters (Alan Hale), a disgraced World War 1 naval officer, is the Captain of a salvage-ship in New Orleans in 1925. He crosses paths with Evelyn Inchcape (Laura La Plante), a man-hating owner of a cabaret and the heir to a fortune, and Karl Ludwig (Peter Erkelenz), a former German submarine commander, searching for salvation on the docks of New Orleans.