Holly Black makes her adult debut with Book of Night, a modern dark fantasy of shadowy thieves and secret societies.

In Charlie Hall’s world, shadows can be altered, for entertainment and cosmetic preferences—but also to increase power and influence. You can alter someone’s feelings—and memories—but manipulating shadows has a cost, with the potential to take hours or days from your life. Your shadow holds all the parts of you that you want to keep hidden—a second self, standing just to your left, walking behind you into lit rooms. And sometimes, it has a life of its own.