Together they fought in Chechnya, together they survived deadly trials, but in peaceful life all their combat skills remained unclaimed. That is why Arkady Serebrov and his comrades agree to secretly deliver two mysterious containers, crossing several state borders, to a given area of Iran. They are explained that this operation is supposedly a test of the security forces opposing terrorists, but the friends are used to trusting only each other. This is what saves them - the most difficult forced marches, fleeting battles with an unknown enemy, crossing mountain passes - only in conjunction with a reliable partner can you get through this and survive. The task is completed, but another, even more dangerous one lies ahead...