Colonel of the FSB Counter-Terrorism Directorate Viktor Loginov arrives in Crimea on a case that is not very complicated at first glance. A few months ago, he finally managed to eliminate the traitor, ex-FSB officer Kashcheev, who, while being pursued, fell into a deep adit in the rock. But a group of speleologists does not discover the body of the fugitive traitor... In the most incredible way, Kashcheev manages to survive, and now Loginov needs to get on his trail at all costs. Kashcheev, meanwhile, establishes contact with the CIA, from where he receives the task of blowing up the compressor station of a gas pipeline being built in the Krasnodar Territory. Loginov already has some clues confirming that he is on the right path, but will he have time to prevent the impending disaster...