Sergei Prokhorov's mother is seriously ill. You need money for treatment, but where can you get the sum with five zeros in a huge indifferent city? How to maintain dignity in this world that lives by the law of the jungle? However, Sergei does not think, he acts - and he himself does not even notice how he finds himself in the rapid whirlwind of events. Fights without rules, mafia, corrupt love, secrets of the Reich, special cells of the Lubyanka, Vikings, communist lies and thieves' concepts - all these are links in an invisible chain connecting the past and the future. Seryoga, a simple guy with a Russian character, will have to walk along it, deftly balancing over the abyss. To grab the capricious bird of luck more tightly by the shabby tail...