Rus' of the sixteenth century...Yesterday's Pomors and former archers Stepan and Lavrentiy plow the Varangian Sea on board the "Holy Virgin" - the first Russian warship. The commander, the boyar's son Vasily Pronchishchev, is pleased with his fellows, but he cannot wait to lead the ship to the walls of Narva, where the army of Ivan the Terrible is barely holding back the onslaught of the Swedish thugs. And the team of the “Holy Virgin” would certainly have made it on time if the novice sorcerer Lavrenty had not encountered the power of pagan gods in the Sacred Grove who do not accept the powers of the Alatyr Stone...