The first story about combat swimmer Kostya Kudinov.

A Chechen field commander nicknamed Accountant, who once worked in a Grozny bank, according to reports from the FSB and the Anti-Terrorism Center, was listed as “destroyed during the operation in the Argun Gorge,” which was it just suits him. He still counted well and had animal instincts. And now the Accountant was sure that he had calculated everything correctly. The militants easily seized a ship with hostages in the Black Sea. Everything seems to be going well for them, but below, below the decks, there is an “evil spirit” capable of appearing from “nowhere” and going to “nowhere.” This “superman,” who brutally exterminates bandits one after another, is a former fighter in the elite unit of “underwater saboteurs” Kostya Kudinov. By chance, finding himself in the right place at the right time, he sets himself the task of freeing the hostages. And he does his duty as he was once taught. But who could have imagined that a torpedo would be fired at the ship?...

The story was published under the titles “The Domino Principle” and “Chechen Roulette.”