The film is not in great shape. There are parts where it's hard to understand what's happening. If you stick it out to the end it makes sense, but you have to fill in the gaps yourself. Worth it just for Peter Lorre's performance.
A masterpiece of narrative incoherence with all the poetic lucidity of a fever dream! That last shot, a structural rhyme, is inexhaustible in its clear-eyed confusions: love is the nightmare from which we will never awake.