June 1944 A Po-2 night bomber crashed over the front line lands in unfamiliar terrain. In the morning, the crew is amazed to learn that this is not the USSR and not the rear of the enemy, but Ancient Russia. Pilots face a choice: try to return to the regiment by any means or get involved in the struggle of Russians with the Livonian Order? In addition, despite the Middle Ages, the enemy is smart and insidious, deadly and ready to do anything to eliminate the sudden threat to his plans...