
An FBI agent works with a refugee scientist and the Coast Guard to crack a Soviet spy ring in Boston.
Cast

George Murphy
Inspector James 'Jim' Belden

Finlay Currie
Professor Albert Kafer

Virginia Gilmore
Millie / Teresa Zalenko

Karl Stepanek
Alexi Laschenkov / Gregory Anders

Louisa Horton
Mrs. Elaine Wilben

Peter Capell
Chris Zalenko / Gino
Bruno Wick
Luther Danzig
Vilma Kurer
Mrs. Rita Foss
Ann Thomas
Philadelphia Suspect

George Roy Hill
Nicholas Wilben
Karl Weber
FBI Agent Charlie Reynolds
Michael Garrett
Michael Dorndoff aka Frank Torrance
Lotte Palfi Andor
Anna Kafer
Ernest Graves
Robert Martin
Robert Carroll
Boldany

Wolfgang Zilzer
August Helmuth
Bradford Hatton
Harry Mason

Rosemary Pettit
Mrs. Martin
Eva Condon
Landlady

Steve Mitchell
Samson
John Farrell
Taxi Driver (uncredited)

Nancy Hale
Mrs. Belden (uncredited)
Westbrook Van Voorhis
Narrator (voice) (uncredited)

Mary Young
Old Lady (uncredited)
Suzanne Moulton
Sherry Belden (uncredited)
Crew

Alfred L. Werker
Director
Leo Rosten
Screenplay, Story
Angelo Ross
Editor
Peter Ratkevich
Assistant Editor
Joseph C. Brun
Director of Photography
Louis De Rochemont
Producer
Lothar Wolff
Associate Producer
Borden Mace
Associate Producer
George Stoetzel
Camera Operator
Edward Horton
Camera Operator
Shirlee Weingarten
Casting Director
Lodge Cunningham
Sound
Louis Applebaum
Original Music Composer
Jack Shaindlin
Music Director
Laurence Heath
Additional Writing
Emmett Murphy
Additional Writing
Virginia Shaler
Additional Writing
Thomas Whitesell
Unit Manager
Herbert Andrews
Art Direction
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