An ancient dagger, captured during a robbery against a jeweler, in a bizarre way connects the medieval sect of professional killers and founders of terror - the assassins - with the international leader of terrorism, who settled in an impregnable mountain fortified area during the Chechen War. He is practically invulnerable, but suddenly a certain “third force” appears on the territory of the republic, both attacking federal troops and brutally dealing with field commanders and mujahideen detachments. On whose side is the strictly secret operational combat group “Sandal”? And what is the ultimate goal of their seemingly chaotic and contradictory, but in fact carefully and cleverly thought out actions?