Anyone who has ever been to the Sector strives to penetrate its heart - the Depth. They say that some of those who got there returned changed, but most disappeared without a trace. They also say that it is there that one can find the answer to the secret of the Sector. Danila Astrakhan undertakes the task of penetrating into the Deep and receives the key to it. Now Danila faces a ninety-kilometer journey: through distortions, through extinct cities where only ghosts of the past and mutants live, through ruined lands inhabited by creatures of the Sector. And a group of experienced mercenaries has already been sent to intercept the expedition, and they are commanded by Danila’s old enemy, stubborn and merciless. The campaign has begun. There are no rules in the Sector. And everyone needs the key to its secrets!