The novel is about the secret activities of Soviet intelligence officers in the second half of the 1960s. The main character, known by the pseudonym Zenith, actively takes part in protest actions in West Berlin together with youth leaders. He manages to uncover information about secret experiments carried out by American scientists and to free his comrade from the captivity of Western special services. The book describes the complexities and dangers of an intelligence officer’s work, his constant struggle with the enemy, and carrying out the task set by the Motherland.