From Number 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 this gripping story set in the Cosmere universe told by Hoid, where two people from incredibly different cultures must work together to save their worlds from certain disaster.

Yumi has spent her entire life in strict obedience, granting her the power to summon the spirits that bestow vital aid upon her society - but she longs for even a single day as a normal person. Painter patrols the dark streets dreaming of being a hero - a goal that has led to nothing but heartache and isolation, leaving him always on the outside looking in.

In their own ways, both of them face the world alone.

Suddenly flung together, Yumi and Painter must strive to right the wrongs in both their lives, reconciling their past and present while maintaining the precarious balance of each of their worlds. If they cannot unravel the mystery of what brought them together before it's too late, they risk forever losing not only the bond growing between them, but the very worlds they've always struggled to protect.