April 1941. According to intelligence received by the Chekists, a fascist sabotage group plans to blow up one of Moscow's defense plants. To find out the plans of saboteurs working under the auspices of the German embassy, the NKVD sends one of its best employees, Sergei Biryukov, to the plant. He finds contact with the fascist agent Keller and finds out that the explosion is scheduled for June 21...

One of Us (1971)
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Georgiy Yumatov
Sergei Biryukov

Dmitriy Masanov
Sedoy

Valentin Grachyov
Gromov

Nikolay Grinko
Keller

Fyodor Nikitin
Franz Rediger

Igor Dmitriev
Otto Breyer

Arkadi Tolbuzin
Stepanov

Tamara Syomina
Tanya