Unlike a bad dancer, a good system administrator is only hindered by cuckoo eggs. They are put into his computer by evil hackers so that they can hatch into programs that make their cuckoo father a superuser. System administrator Clifford Stoll accidentally discovered that someone else was logging into the system using the data of an employee who quit six months ago. A hunt for hackers began, which ended in the detention in 1987 of residents of Germany - the legendary hacker Marcus Hess and his three accomplices Hans Huebner, Dirk-Otto Brzezinski and Karl Koch, who successfully attacked 400 computers of the US Department of Defense and its contractors and sold the obtained secrets to the KGB. The author spoke in detail and honestly about how he was able to expose Soviet cyber spies. Unlike American films devoted to the same problem, which are heavily stuffed with technical blunders, this documentary detective story accurately describes the work of hacker hunters.