"A doctor is driven into an investigation of sinister goings-on at a horse race track by his mystery writer ex-wife."
William Powell
as Dr. Lawrence 'Brad' Bradford
Jean Arthur
as Paula Bradford
James Gleason
as Inspector Corrigan
Eric Blore
as Stokes, Bradford's Butler
Robert Armstrong
as Nick Martel, Bookie
Lila Lee
as Miss Prentiss, Bradford's Receptionist
Grant Mitchell
as John Summers, Luxury's Owner
Erin O'Brien-Moore
as Mrs. Summers
Ralph Morgan
as Leroy Hutchins, War Cloud's Owner
Lucile Gleason
as Mrs. Hutchins
Johnny Arthur
as Mr. Frankenstein (uncredited)
Stanley Blystone
as Police Radio Operator (uncredited)
Tom Brower
as Police Sergeant (uncredited)
Spencer Charters
as Dr. Bunting (uncredited)
Frankie Darro
as Spike Salisbury (uncredited)
John Dilson
as Analyst Examining Gelatin Capsule (uncredited)
James Donlan
as Taxi Driver (uncredited)
Paul Fix
as Lou Pender (uncredited)
Dorothy Granger
as Fill-in Receptionist (uncredited)
Sam Hayes
as Race Announcer (uncredited)
Rollo Lloyd
as Landlord (uncredited)
Edward McWade
as Minister in Film (uncredited)
Frank Reicher
as Henry Strand (uncredited)
Charles Richman
as Mr. Curtis (uncredited)
Syd Saylor
as Detective (uncredited)
John Sheehan
as Bert Murphy (uncredited)
Buster Slaven
as Newsboy (uncredited)
Al St. John
as Morgue Attendant (uncredited)
Henry Stone
as Ray Torro (uncredited)
Bob Tansill
as Joe Jerino (uncredited)
Frank M. Thomas
as Mike North (uncredited)
Perry Ferguson
Assistant Art Director
Darrell Silvera
Set Dresser
Anthony Veiller
Screenplay
Wallace Fox
Second Unit Director
Louis Shapiro
Second Assistant Director
John Sherwood
Clem Portman
Sound
Harry Redmond Jr.
Special Effects
Jack MacKenzie
Second Unit Director of Photography
Max Steiner
Original Music Composer
Roy Webb
Amalia Kent
Script
Ruthalice Selznick
Stephen Roberts
Director
James Edward Grant
Story
Edward Kaufman
Associate Producer
J. Roy Hunt
Director of Photography
Van Nest Polglase
Art Direction
Bernard Newman
Costume Design
Clem Beauchamp
Assistant Director
John L. Cass
Sound Recordist
Arthur Roberts
Editor
Music Director