This is a murder mystery sung all the way through. The two heroes are Vance & Holmes. After the murder is committed, Franklin Pangborn answers the call to the detective agency and sings his answers ( in a good tenor--who knew he could sing?). The main detective is in a nightclub, and when informed of events, he sings his goodbye, and then the nightclub employees and patrons all troop out to help solve the mystery (nobody forgets their drinks!). I won't say anymore so I don't spoil it, but the entire thing is well worth watching. Enjoy trying to identify the music- MGM's orchestra was good at mysteries!