Charlie Hall has spent half her life working for gloamists, magicians who manipulate shadows to peer into locked rooms, strangle people in their beds, or worse. Gloamists guard their secrets greedily, creating an underground economy of grimoires. And to rob their fellow magicians, they need Charlie Hall. Now, she’s trying to distance herself from past mistakes, but getting out isn’t easy. Bartending at a dive, she’s still entirely too close to the corrupt underbelly of the Berkshires. Not to mention that her sister, Posey, is desperate for magic and that Charlie's shadowless, and possibly soulless, boyfriend has been hiding things from her. When a terrible figure from her past returns, Charlie descends into a maelstrom of murder and lies.