Other titles: Dunkle Geschäfte | Le mystère de la section 8 | Jornada Sinistra | Despedida | Spioncentral Stockholm | La mujer enigma | Vakoilukeskus Tukholma | Ypovryhion U-845 | To mystikon tou 8ou grafeiou kataskopeias | Sötét utazás | Kémek – Ellenkémek | Le tre spie | 間諜（1937） | 어두운 여로 | Menschen met maskers | Mensen met maskers | Szef wywiadu | Jornada Negra | Мрачное путешествие | Casuslar Harbi | Mračni poslovi | The Anxious Years
Year Released: 1937
Month released: January
Certification: Australia:G, Canada:G, Finland:K-16, France:Tous publics, Norway:16, United Kingdom:U, United States:Not Rated
Directors: Victor Saville
Cast: Alf Casha, Anthony Bushell, Anthony Holles, Austin Trevor, Cecil Parker, Charles Carson, Conrad Veidt, Cyril Smith, Douglas Stewart, Edmund Willard, Eliot Makeham, George Spence, Gerald Case, Gilbert Davis, Gordon Begg, Henry Oscar, Joan Gardner, John Clifford, John Justin, Laidman Browne, Lawrence Hanray, Leo de Pokorny, M. Martin Harvey, Margery Pickard, Michael Martin Harvey, Nina Keech, Percy Walsh, Philip Ray, Reginald Tate, Robert Newton, Sam Livesey, Theodore Wilhelm, Torin Thatcher, Ursula Jeans, Vivien Leigh, Wallace Bosco, William Dewhurst
Production Companies: London Film Productions
Camera and electrical department: Jack Cardiff
Certification: Australia:G, Canada:G, Finland:K-16, France:Tous publics, Norway:16, United Kingdom:U, United States:Not Rated
Colorization: Black and White
Costume department: Eugene Joseff
Country: United Kingdom
Distributors: Anglo-American Film Corporation, Artistas Unidos, Devonshire Film Company, Dr. Hauser & Company, Kommunenes Filmcentral (KF), Los Artistas Unidos de América del Sur, Madacy Entertainment, United Artists, United Artists (Australasia)
Other Companies: Western Electric