The Winter of the Witch

The third and final installment of the Winternight Trilogy opens in the aftermath of catastrophe. Moscow, the seat of Grand Prince Dmitrii Ivanovich, has barely survived a night of fire and treachery, saved only by a miraculous snowstorm. Vasilisa Petrovna (Vasya), a young woman with the rare ability to see and speak with chyerti, the spirits of Russian folklore, inadvertently caused the fire by freeing an enchanted golden mare called Pozhar, the firebird, and now faces the city's wrath. As Dmitrii surveys the wreckage with Vasya's older brother Aleksandr (Sasha), a monk and the Grand Prince's cousin, workers discover an undamaged golden bridle in the burned stable, an artifact the sorcerer Kasyan used to control the firebird. Dmitrii locks it in his treasure-room.

Father Konstantin Nikonovich, a golden-haired priest consumed by hatred and desire for Vasya, channels Moscow's grief into rage against her. A mob descends on the palace of Vasya's elder sister Olga Vladimirova, the Princess of Serpukhov. To protect her family, Vasya slips outside. Her magical horse Solovey bursts from the stable to carry her to safety, but the mob breaks his leg and cuts his throat. Vasya, beaten unconscious, is dragged to the frozen river and locked in a cage atop a pyre.

As fire consumes the pyre, desperation awakens a dormant power. Vasya tears apart the burning bars and leaps through the flames, landing unseen, having involuntarily made herself invisible. The chyert called Medved (the Bear), a one-eyed chaos-spirit, reveals that his twin brother Morozko, the winter-king and death-god, freed him from centuries of imprisonment in exchange for saving Vasya's life. Vasya refuses the Bear's help and flees into the crowd. Varvara, Olga's body-servant and secretly a daughter of the legendary witch Baba Yaga, finds Vasya and guides her onto the Midnight-road, a realm of perpetual darkness where those with the sight can cross vast distances. Vasya loses consciousness.

She awakens in a strange patchwork forest and walks through shifting landscapes until she reaches a frozen lake ringed by ancient trees. Magical horses that transform into birds graze in the meadow, and a ruined house stands at the water's edge. From a lake-spirit, Vasya learns this house belonged to her great-grandmother, the witch behind the legend of Baba Yaga. Vasya's grandmother Tamara was seduced by the sorcerer Kasyan, who stole the firebird with the golden bridle. Tamara rode after him and never returned.

The Bear finds Vasya and offers an alliance: vengeance in exchange for overthrowing the princes and the church. Vasya refuses. He unleashes his upyry (vampires), but her great-grandmother, who persists as a spirit in Midnight, intervenes and drives them off. The old woman wants Vasya as her heir, but Vasya insists she must first bind the Bear and protect her family.

Vasya resolves to find Morozko and asks Pozhar to guide her through Midnight, since blood calls to blood among the magical horses. Along the way, she saves Vladimir Andreevich, the Prince of Serpukhov, from a river-spirit that flooded the waters on the Bear's orders, destroying the silver tribute meant for the Tatars and ensuring war. They find Morozko imprisoned in an ancient Midwinter village, trapped not by chains but by forgetfulness: He sits at a feast with no memory of Vasya. She challenges him to a knife-fight and speaks of shared memories until he wounds her deeply and she collapses. Morozko carries her to a bathhouse, where physical intimacy draws him back to himself. He explains he freed the Bear because he believed Vasya could be a bridge between humans and chyerti, keeping the old spirits from fading. Pozhar suggests using the golden bridle to bind the Bear.

Vasya and Morozko ride back toward Moscow, joining Sasha and Father Sergei Radonezhsky, the holiest monk in all the Russian lands, on the road. In Moscow, the Bear's influence has brought plague and walking dead. Vasya infiltrates with Olga's help, but Konstantin recognizes her. Fleeing in panic, she inadvertently summons Morozko to the treasure-room, where she finds the golden bridle and wraps its ropes around her wrists.

Konstantin seizes Olga at knifepoint, and the Bear summons plague-dead upyry through the gates. The fighting is desperate until Sergei collapses every upyr with a prayer powered by genuine faith. Konstantin, shattered by the realization that God may have been real all along, cuts his own throat. His willing sacrifice weakens the Bear, and Vasya binds him with the golden ropes. Morozko leads his twin into the darkness.

War still looms. With the tribute silver lost, battle against the Tatar general Mamai is inevitable. Morozko, unable to endure summer, departs for his winter lands, revealing that Vasya is the great-grandchild of Chernomor, the sea-king, which explains her extraordinary power. Vasya takes the Midnight-road with Sasha to find Vladimir and bring him to the mustering, but Polunochnitsa (Lady Midnight), the ruler of the Midnight-road, is furious that Vasya failed to unite the chyerti and redirects the road into the Tatar camp. Vasya and Sasha are captured.

Vasya orchestrates an escape by terrifying the camp's horses but must leave the wounded Sasha behind. Pozhar, summoned by Ded Grib, a mushroom-spirit who has become Vasya's ally, carries Vasya into Midnight. There, Vasya offers the bound Bear a bargain: complete freedom in exchange for his sworn oath to serve her and never again unleash destruction on the Russian lands. The Bear swears. She then catches Lady Midnight with the golden rope and demands her allegiance. Midnight recognizes Vasya as Baba Yaga's true heir and swears loyalty.

With her new allies, Vasya rescues Sasha and Vladimir. Oleg of Ryazan, a Russian prince allied with the Tatars, witnesses the supernatural power and secretly agrees to switch sides. The princes muster at Kolomna, where Vasya secures a promise from Dmitrii and Sergei: They will never condemn witches or punish those who honor the old spirits. In exchange, she gathers the chyerti to fight alongside the army at the Battle of Kulikovo on the banks of the Don.

Sasha rides out for single combat against the Tatar champion Chelubey and wins, but Vasya spots a mortal wound beneath his armor and carries him from the field. In the forest beyond life, Sasha's spirit refuses the Bear's blood, which can restore the dead. He gave his life freely and asks Vasya to guard the land.

Vasya charges back into battle alongside Morozko, who has returned with the first snow, and the Bear. Together they pour fire, winter wind, and terror into the Tatars' ranks. Oleg charges from one flank; Vladimir's cavalry bursts from the forest on the other. The Tatar line shatters.

In the aftermath, the Bear reminds Morozko of an outstanding debt. Morozko produces a dead nightingale, Solovey's spirit, preserved with his healing power, and together the twin brothers restore the bird to life. Hoofbeats sound behind Vasya, and her beloved horse, alive again, touches his nose to her cheek.

The Bear departs, bound by oath but free. The chyerti confirm their allegiance. Vasya and Morozko ride together into Midnight, she on Solovey and he on the white mare, heading north to bring Olga news of Sasha's death, then eventually to the lake, where Vasya will build a hidden country for chyerti, witches, and the old ways behind Dmitrii's newly united Russia.