A group of employees of the external surveillance service of the St. Petersburg FSB Directorate is conducting operational activities to identify members of an organized criminal group suspected of smuggling. Suddenly it turns out that, in addition to participating in illegal transactions with non-ferrous metals, one of the criminals is a link in a long chain of intermediaries through whom terrorists buy the most modern weapons in Russia and abroad... Welcome to the mysterious world of “invisible” from the FSB special forces! No preparation for a major operation can be done without them. They are highly qualified professionals. Excellent analysts, actors and... ordinary people who have their own very earthly problems.