Explosions, drugs, kidnappings — criminals are ready for anything today. But if the threat of a terrorist attack is added to these common crimes today, professionals from the Federal Anti-Terrorist Service (FATF) are involved in the case. A year ago, the FATF almost lost its best employee, Martynov, when his wife and daughter were killed in an assassination attempt. Martynov returns to the service and realizes that everything that is happening around him is forming a kind of puzzle, the creator of which is a very dangerous enemy. Perhaps the most dangerous in recent history.