William Beaudine (Director) · Martin Mooney (Screenplay) · Fulton Oursler (Story)
Sidney Blackmer
Police Commissioner Thatcher Colt
Rick Vallin
Anthony 'Tony' Abbot (as Ricki Vallin)
Byron Foulger
Everett P. Digberry
Herbert Rawlinson
District Attorney Bill Dougherty
Lynn Starr
Miss Spencer
Barry Bernard
Capt. Edgar Walters / Frank Galloway
Trude Rosen
Nina Politza
Thornton Edwards
Enrico Lombardi
John Ince
Police Captain Mike Flynn
Martin Ashe
Officer Murphy
Walter James
Police Captain Tom Henry
Frank Darien
Samuel Wilkins
Joseph DeVillard
Antonio Spogucci (as Joseph M. De Villard)
Jacques Vanaire
Guiseppe Bartarelli (as Jack Vanaire)
Willy Castello
John Martin George (as William Castello)
Harry Clark
Officer Lou Levinsky (as Harry Clarke)
Lew Leroy
Apartment Manager (as Lou LeRoy)
Billy Mitchell
Nicodemus J. Brown
Florence O'Brien
Petunia
Harte Wayne
Coroner
Pat McKee
Joe Morgan
Casey MacGregor
Police Sergeant Flanagan (as Casey McGregor)
Billy Snyder
Hotel Manager Stevens
Sam Lufkin
Lombardi's Police Escort (uncredited)
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The police arrest a man climbing over the wall of a cemetery after midnight. He claims that he is being blackmailed and is following instructions he received by mail to leave $1000 on a certain grave. It turns out that he's not the only one who got a blackmail letter from the same person--calling himself "The Black Panther"--and it also turns out that all the recipients are connected to an opera company.
