Reginald Denny is a playwright reluctantly trying to solve a double murder. Since he writes murder plays, everyone seems to expect him to be able to solve the murder of two producers, one found tied up in a closet, another shot in the head without a gunshot being heard.
Jack LaRue, as a gangster trying to help Denny, steals every scene he's in. Inez Courtney plays the producers' secretary, and naturally she's nuts about Denny - but he's too dumb to notice. The big surprise was seeing Hugh Marlowe (billed as John Marlowe) in one of his earliest roles. The not-so-big surprise is that he was obnoxious even that far back.
The climax is preposterous. Denny pens a quickie play which is performed in front of the police and all the suspects, and the murderer is revealed. He couldn't have just said "So and so did it." No, that would have only taken five seconds.
One scene I especially enjoyed is when Denny is in his apartment at night getting ready to take a bath. He is interrupted by a constant parade of people begging him to solve the murder. Then four cops show up as well, and search the place. The only thing missing was Margaret Dumont opening the apartment door and everyone tumbling out.