From #1 New York Times bestselling author Brandon Sanderson-creator of The Stormlight Archive, the Mistborn saga, and countless bestselling works of science fiction and fantasy-comes a new standalone novel set in his Cosmere universe. In the next Cosmere standalone novel, Hoid has an epic tale to share: In a forgotten land sustained by colorful rivers of demon blood, a young woman named December learns a devastating plague is on its way. But who will believe her? Against impossible odds, she sets sail up the River Violet to warn the king's court, determination-and wisdom beyond her years-burning in her eyes. With a chatty priestess and a fledgling fashion designer at her side, she must navigate incredulous royal officials, twisted court intrigue, and a roguish count who might hold the key to her quest-and her heart.