Chetyre i pyat (1924)

The early years of NEP. Soviet pilot Dmitry Gai is working on an invention of military importance. His friends, James and Natasha, vigilantly monitor the progress of work and do not allow information leakage. However, members of the mysterious five spies, Nellie and her accomplice manage to break into the laboratory and steal the blueprints. The inventor rushes in pursuit of the kidnappers.