In 1936, a civil war began in Spain. On one side are the Republicans, among whom there were communists, on the other are the rebels of General Franco. But behind the scenes of the overt war, a second, secret war was also unfolding. The Republicans were supported by the Soviet Union. Frankists - Hitler's Germany: money and weapons. In a war invisible to ordinary people, intelligence services from different countries have clashed. If you are an agent of Tsentrorozysk, then this is forever. Even if you are forced to live in another country, you live under someone else’s guise. And you cannot stay away if your Motherland needs it. And if an old friend, Artur Khristianovich Artuzov, also asks for the same thing... And the request is simple and at the same time almost impossible - to prevent German supplies of weapons to Spain. And again, Tsentrorozysk agents get down to business: Vasily Kubarev and Fedorovich.