A series of mysterious murders is happening in Moscow—its victims, at first glance, have nothing in common with each other. At the same time, information reaches Russian special services that a mysterious organization calling itself the "Russian Brigade" is preparing a series of terrifying terrorist attacks in the capital. The lives of millions of city residents are at stake. It falls to Alexander Borisovich Turtetsky, an assistant to the Prosecutor General, to expose the criminals and prevent the execution of their audacious plans…