Murder at Midnight (1931)

Wealthy Mr Kennedy shoots his secretary Channing during a parlor game but it turns out the gun was loaded with real bullets Luckily criminologist Phillip Montrose is on hand to help the police When Kennedy quickly ends up dead as well the police think its a tidy murdersuicide but the family lawyer knows of a letter that voiced Kennedys suspicions about someone who was out to get him Soon the cops are on the trail of a ruthless and clever killer who is one step ahead of even Montrose