Dangerous Flight

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 Dimovs mistress Paris France Dimov and Belcheva go out leaving a bag with secret documents in Belchevas 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