Ivan's best friend, Kamen, is dying in an American hospital. Since he's denied a visa to the USA and can't stay by his side in his last moments, he decides to set off for Bulgaria countryside, taking the camera Kamen has given him. After some time, he writes her a very special letter, telling all about the places and characters he meets on his way, witnesses to a time which is bound to be forgotten.
During World War II, a plane transfers Bulgarian antifascists from the USSR to Bulgaria. They jump with parachutes. The eighth paratrooper heads a guerilla group. In the group, there are doubts about the existence of a traitor. Initially, an innocent person is accused, but later the real traitor is caught and killed. Still, the most dangerous enemies of the guerillas are the colonel and the troops stationed in the nearby village. The battle between them and the guerillas is won by the latter who continue to fight for their cause.
People from all over the world spend their summer holidays at the Black Sea. German Walter and his girlfriend Gisela check in at the hotel as spouses. Walter uses the passport of his wife. The police find the body of a young woman washes up by the waves. Inspector Damyanov begins an investigation. Walter is not under suspicion, but he is ill at ease. It is because of his wife passport? Ex-Nazi officer Kunze has his own little secret and causes for worry. Dutch musician Jan has something on his conscience, too, after a little love with a Bulgarian girl. Having penetrated the unsavory secrets of all those people, Damyanov leads them to the conviction that it is difficult to live a life of deception.
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.
On the road one day two people meet again after seventeen years. They'd had a brief, burning affair seventeen years earlier, in their idealistic youth. That had been just after the war, the time of great enthusiasms and faith in the future. Wishing to dedicate themselves to the new society they had chosen to renounced personal happiness, considering their love as an impermissible sidetrack from the requirements of the time.
In a concert, one of the musicians suddenly rushed to the sky. There he waits at St. Peter's Gate to be received. Inside, pathetic music is played. A musician plays jazz. The angels begin to tremble in rhythm
