Professor Dimov is a diplomat who has been recruited as a spy by a foreign intelligence service. The suspicions fall on Dr. Belcheva. Major Kalinov is entrusted with the investigation of the case. He learns that she is Dimov's mistress. Paris, France. Dimov and Belcheva go out leaving a bag with secret documents in Belcheva's hotel room. Kalinov manages to retrieve the documents. After this incident Belcheva dies in hospital from poisoning. On board the plane Kalinov exposes the professor as a spy. Bulgarian counterintelligence officers arrest him.
Preslav Petrov
as
Lyubomir Kiselichki
as
Nevena Kokanova
as
Bogomil Simeonov
as
Georgi Cherkelov
as
Петър Слабаков
as
Vessela Radojeva
as
Svetoslav Peev
as
Georgi Dzhubrilov
as
Naicho Petrov
as
