"Van Heflin stars as the head of a city crime lab who tries to solve the murder of the town mayor by scientifically analyzing evidence."
Van Heflin
as Gordon McKay
Marsha Hunt
as Jane Mitchell
Lee Bowman
as Gerald I. Ladimer
Samuel S. Hinds
as Mayor Daniels
Cliff Clark
as Captain Lynch
Eddie Quillan
as Eddie Wright
John Litel
as Matty
Cathy Lewis
as Bessie Wright
Nella Walker
as Mrs. Daniels
Robert Blake
as Boy in Car (uncredited)
Leon Belasco
as Chris Spyro - Cook (uncredited)
Margaret Bert
as Miss Huser - Mayor's Secretary (uncredited)
Eugene Borden
as Pierre - Headwaiter (uncredited)
Roy Brent
as Suspect (uncredited)
George M. Carleton
as Taggart - Third Politician (uncredited)
Eddy Chandler
as Rosson - Detective Grilling Eddie (uncredited)
Ken Christy
as Police Chief Spencer (uncredited)
Mark Daniels
as Reporter (uncredited)
Paul Fix
as Allison Stacy (uncredited)
James Flavin
as Keenan - Detective Grilling Eddie (uncredited)
Howard Hickman
as Clemence - First Politician (uncredited)
Al Hill
as Henchman Collecting from Eddie (uncredited)
Edward Keane
as Forsythe - Second Politician (uncredited)
William Lally
as Mack - Detective (uncredited)
Mitchell Lewis
as Restaurant Proprietor (uncredited)
Jack Sterling
as Steve - Detective (uncredited)
Emmett Vogan
as Novak - Detective Grilling Eddie (uncredited)
Ava Gardner
as Car Hop (uncredited)
George Lloyd
as Joe 'Bulge' Salinas (uncredited)
Ernie Alexander
as Truck Driver Eating at Eddie's (uncredited)
Sam Ash
as Card Player in Montage (uncredited)
Brandon Beach
as Club Patron (uncredited)
Brooks Benedict
Hugh Chapman
as Newsboy (uncredited)
Kit Guard
as Restaurant Customer (uncredited)
Edward Hearn
John Ince
Wilbur Mack
as Newspaper Reader in Montage (uncredited)
Philo McCullough
as Last Voter and News Reader (uncredited)
Thomas Murray
as Policeman Arresting Eddie (uncredited)
George Noisom
as Special Delivery Messenger (uncredited)
Monty O'Grady
Tom Quinn
Jack Woody
as Fisherman (uncredited)
Duke York
as Card-Playing Henchman (uncredited)
Jeff York
as Henchman (uncredited)
Paul Vogel
Director of Photography
John C. Higgins
Screenplay
David Snell
Original Music Composer
Fred Zinnemann
Director
Jack Chertok
Producer
Ralph E. Winters
Editor
Story
Allen Rivkin
Douglas Shearer
Sound Director
Dore Schary
Executive Producer
Stunt Coordinator
Stunts
Cedric Gibbons
Art Direction
Edwin B. Willis
Set Decoration
Jerry Bresler
Unit Manager
Hayes Goetz
Assistant Director
Randall Duell
Assistant Art Director
Eugene Joseff
Other
Daniele Amfitheatrof
Additional Music
Lennie Hayton