About the book: 2008 / Marine special forces soldier Serega Pavlov, nicknamed Polundra, was extremely surprised by the next task. It seemed frivolous to him. Why should he, a top-class professional, look for some yachtsmen lost in a stormy sea? He didn’t know that he would end up in the very epicenter of a psychotropic weapon test. Polundra knows how to fight combat swimmers, but he doesn’t even know how to resist an invisible enemy. Although his combat experience tells him that it is better to fight the enemy with his own weapons…