Zahra and Maryam have been best friends since childhood in Karachi, even though—or maybe because—they are different in nearly every way. They never speak of the differences in their backgrounds or their values, not even after the fateful night when a moment of adolescent impulse upends their plans for the future.

Three decades later, Zahra and Maryam have grown into powerful women who have each cut a distinctive path through London. But when two troubling figures from their past resurface, they must finally confront their bedrock differences—and find out whether their friendship can survive.