The Sphinx (1933)

Lionel Atwill is "Jerome Breen" - a deaf mute accused of murder on the basis that he was heard speaking at the scene of the crime. When doctors confirm that to have been impossible, he is acquitted - but not everyone believes him. Reporter Theodore Newton ("Jack") determines to get to the bottom of it, and matters take a more immediate turn when his co-worker "Jerry" (Sheila Terry) - on whom he has a bit of a crush - is assigned to write some short articles on the man and becomes infatuated with him. Atwill always did make for a good baddie and here he (and his facial expressions) do their job well - without speaking a word. Coupled with a secret room and a dead piano key as well a police officer (Paul Hurst) who is actually quite effective, despite himself, we have quite a decent little mystery here. The ending isn't the best, to be honest - it's a little as if they just ran out of film so had to wrap it up quickly, but it is still a good hour's entertainment.