Heeeeeeeeeeere's Ed. Ed McMahon, that is, who plays a once brilliant but now seemingly senile inventor who is murdered in his electric train workshop. This one's a toughie because it appears as though no one could have entered or left the workshop during the time in which the murder must have taken place.
Keywords: 1940s , cheerful , detective , murder-investigation , new-york-city , nypd , post-world-war-ii , writer