The main character, Soviet intelligence officer Anton Volkov, fearlessly enters into an unequal battle with the all-powerful Abwehr. In the spring of 1940, three intelligence services at once - German, Soviet and English - are looking for Colonel Marchevsky, who was lost in Poland, and who holds the secret code for the card index of the intelligence department of the Polish General Staff. Marchevsky is discovered by the Abwehr, but before that the colonel manages to make contact with his contact. But with whom?.. A deadly game with far-reaching political consequences begins.