January 1918. Laura Iven was a revered field nurse until she was wounded and discharged from the medical corps, leaving behind a brother still fighting in Flanders. Now home in Halifax, Canada, Laura receives word of Freddie’s death in combat, but something doesn’t make sense. Determined to uncover the truth, she returns to Belgium as a volunteer at a private hospital. Could Freddie have escaped the battlefield, only to fall prey to something --- or someone --- else? November 1917. Freddie Iven awakens after an explosion to find himself trapped in an overturned pillbox with a wounded enemy soldier. Against all odds, the two form an alliance and succeed in clawing their way out. They take refuge with a mysterious man who seems to have the power to make the hellscape of the trenches disappear.

Moscow has been struck by disaster. Its people are searching for answers --- and for someone to blame. Vasilisa Petrovna finds herself alone, beset on all sides. The Grand Prince is in a rage, choosing allies that will lead him on a path to war and ruin. A wicked demon returns, stronger than ever and determined to spread chaos. Caught at the center of the conflict is Vasya, who finds the fate of two worlds resting on her shoulders. Her destiny uncertain, Vasya will uncover surprising truths about herself and her history as she desperately tries to save Russia, the winter-king Morozko and the magical world she treasures. But she may not be able to save them all.

Vasilisa has grown up at the edge of a Russian wilderness, where snowdrifts reach the eaves of her family’s wooden house and there is truth in the fairy tales told around the fire. Her gift for seeing what others do not won her the attention of Morozko --- Frost, the winter demon from the stories --- and together they saved her people from destruction. But Frost’s aid comes at a cost, and her people have condemned her as a witch. So Vasilisa opts to dress herself as a boy and sets off astride her magnificent stallion. But after she prevails in a skirmish with bandits, the Grand Prince of Moscow anoints her a hero for her exploits. Before she can untangle herself from Moscow’s intrigues, Vasilisa will also confront an even graver threat lying in wait for all of Moscow itself.

In a village at the edge of the wilderness of northern Russia, where the winds blow cold and the snow falls many months of the year, a stranger with piercing blue eyes presents a new father with a gift --- a precious jewel on a delicate chain, intended for his young daughter. Uncertain of its meaning, Pytor hides the gift away and Vasya grows up a wild, willful girl, to the chagrin of her family. But when mysterious forces threaten the happiness of their village, Vasya discovers that, armed only with the necklace, she may be the only one who can keep the darkness at bay.