Sergeant Datsko, nicknamed Swimmer, has been trampling the Afghan mountains for more than a year, risking his life and losing friends. Anything has happened. But this had never happened to him before: sapper Sopilkin from his squad escaped from the checkpoint and went over to the side of the dushmans! In one of the battles he was shot. At first they thought that they had killed a Mujahideen, but when they came closer, they saw their former comrade. And then questions flashed in Datsko’s head: what kind of war is this? Who is friend and who is enemy here? Who to believe? And most importantly, what are all these deaths and losses for?