Story [from a novel by Max Catto]: bad, bad girl (Rita Hayworth) meets youthful American, and finally agrees to marry him though warning him of her past – that of sort of a Mata Hari in Europe. Robert Mitchum, as Jack Lemmon’s pal in a small fishing and smuggling boat operation, is vastly displeased with this development and tips off the Coast Guard on a smuggling trip so that Lemmon abandons the boat rather than be captured as a smuggler.
This lands him on a Greek freighter which crashes into a heavier ship in the fog. Lemmon is pinned down in the hold by a steel girder. Nearly all the second half of the film is centered on efforts to rescue him.
Hayworth is excellent as the comely femme who is always just one step ahead of the law. Lemmon (who takes a bow for composing the harmonica theme) shows plainly that he can handle a dramatic type role while Mitchum, as the tough man of the world, contributes one of his better portrayals.