From #1 New York Times bestselling author Brandon Sandersoncreator of The Stormlight Archive, the Mistborn saga, and countless bestselling works of science fiction and fantasycomes 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, determinationand wisdom beyond her yearsburning 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 questand her heart.