In the brutal Illyrian camps, everyone fears the thief known as Ten Fingers. She steals from commanders, disappears like smoke, and has humiliated the warriors of Windhaven for years. No one knows the infamous criminal is actually sixteen-year-old Arenna — a homeless Illyrian girl with clipped wings and nowhere left to go. When Rhysand sends Cassian to hunt the thief down, he expects a hardened criminal. Instead, he finds a starving girl surviving alone in the shadows of Windhaven. Brought back to Velaris against her will, Arenna must decide whether she can trust the Night Court — and Cassian — before the secrets she stole from the Illyrian camps get her killed.