
Prof. Laurent Akush from the Institute of Geophysics is working on a device that can be used to locate coal underground. For successful work he needs a tube XCX13, it is available in the West, but foreign firms sabotage the supply of the device. In his institute there is an enemy engaged in sabotage, but the professor does not believe in enemies. He believes that this is propaganda, science is above ideology, and that "scientists are made of a different dough." Laurent Akush receives an invitation to the international geological congress in Berlin, there he hopes to meet an old American friend, the scientist McLane. He takes with him his assistant Ferenc Ervish and a young Stakhanovite worker, Ishvan Kadosh. The professor does not yet know that in Berlin, Colonel Thompson of American intelligence is preparing a trap for him.
Genres:

Artúr Somlay as Ákos Lóránt professzor

Ádám Szirtes as István Kádas

Sándor Pécsi as Forgács

Éva Spányik as Éva Takács

Mária Sulyok as Kádas's mother

Hilda Gobbi as Lotte

Gyula Benkő as Ferenc Örvös

István Somló as Thompson

Tivadar Uray as McLane

Károly Kovács as Dr. Conrad

László Kemény as Greenwood

István Velenczei as Boswall

Lajos Soós as Gábor, driver

György Bárdy as Security Officer

János Dömsödi as

Jenõ Horváth as

János Zách as Gál is a teammate

József Berky as

Lajos Sugár as

János Horkay as

Beno Tamas as

Zoltán Várkonyi as comrade Mérnök

László Csákányi as

Gyula Bakos as

László Egri as
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