I absolutely adored the first 15 minutes of this, with Ray Milland so happy to be among humans again that he responds to every interaction with charm and a smile, assuming normalcy despite the silence of the crowd around him, and the way they move in unison. Only when the blind man carefully crumbles his cake does Ray realize that, perhaps, all of this might not be so normal after all. So good!
The rest of the movie was really let down by those 15 minutes, because they set the pace so high, and the tone is so perfect -- there's no way what follows could possibly maintain their level. And it doesn't, but it's still pleasurable: heavy on atmosphere and Milland being pleasingly bland in the midst of a WWII London crawling with Nazi spies, complete with a handful of twists thrown in for good measure.
Thanks for the rec, @Daniel!