In order to survive on her own, twelve-year-old Rooney de Barra collects precious moonlight, which she draws from the evening sky with her (very rare and most magical) lunar mirror. All the while she tries to avoid the rival roughhouse boys, and yet another, more terrifying danger: the dreaded thing that's been disappearing children in the night.

When Trick Aidan, the worst of the roughhouse boys, steals her lunar mirror, Rooney will do whatever it takes to get it back. Even if it means leaping into a pool of darkness after it swallows Trick and her mirror. Or braving the Plentiful Darkness, a bewitching world devoid of sky and stars. Or begrudgingly teaming up with Trick to confront the magician and unravel the magic that has trapped Warybone’s children.