Cast
Reginald Denny as Prof. David Graham
Lloyd Hughes as Lieut. Dan Burke
Claudia Dell as Diana Sullivan (opening credits incorrectly say 'Diane')
James Farley as Chief James Sullivan
Barbara Beford as Kathleen Ryan
Mary Foy as Mary Ryan
Al St. John as Radio officer, Jones
John Elliott as Capt. Bill Withers
Francis Sayles as Police Surgeon Kelly
Henry Roquemore as Dr. McNeil
Lee Prather as Capt. Perkins
Robert Walker as Capt. Jim Phillips
Jack Kenny as Inspector Silverstein
Eddie Davis as Con man in showup room
(uncredited)
Harley Wood as Mary Withers
(uncredited)
Arthur Thalasso as Police officer
(uncredited)
Unknown detective #1
Unknown detective #2
Unknown detective #3
Unknown as Labin
Unknown as Finnegan
Unknown man in showup room #1
Unknown woman in showup room #1
Unknown woman in showup room #2
Unknown man in showup room #2
Unknown cop #1
Unknown cop #2
Unknown detective #4
Unknown gangster (dying)