Paris of the 60s of the last century... The city of “Eternal Love”, “Crazy, Mad World”, “Black Tulip”. In the Bois de Vincennes, in the strictest secrecy, a laboratory is working to improve the drug against humanity - “IC”. Will the dangerous “elixir” become widespread on the planet? NATO refuses to participate in the Vietnam War. France leaves the Alliance. President Charles de Gaulle sends ships loaded with dollar bills to the United States, and in exchange for them returns gold to France. Book 3 continues the series “Call Sign “Swallow”” about the life, love, and service of a married couple of Soviet intelligence officers in France, in the period 1963-1966.