Sergei serves in the Lipetsk riot police. Along with other units, he goes on a business trip to the place of hostilities - the Chechen Republic. While sometimes enduring the impossible and losing his comrades, Sergei does not lose faith in unshakable truths. Believe in your principle. Alexander Ponomarev’s book “Our Principle” is not about war, it is about a man who found himself where the earth was burning. About a person who will forever remain a person, no matter what. Real, honest stories about the life of soldiers and officers of that time. These stories make you laugh and cry, sometimes at the same time, and make you experience every business trip as if you were there yourself. It’s like you’re riding in an armored personnel carrier or in the cabin of a Ural. You are holding a perimeter defense. But, no matter how hard it is and no matter what happens, the main thing is to remember one thing: they don’t abandon their own people, this is “Our principle.”