They were never supposed to meet.Stolen at birth and brought up underground, Luna knows nothing but darkness and isolation. When disaster drives her out of the only home she knows, she stumbles into a world of wonders where monstrous creatures lurk in corridors-along with a mysterious stranger who disappears when danger strikes.Raised by a witch, Aethon has been taught to worship strength and fear nothing. When a hunting expedition keeps him out past curfew, he finally encounters a threat his courage cannot face. With the help of a strange girl he survives the harrowing night, but his life has already begun to crumble.As opposite worlds collide, they will need to rely upon each other to find freedom. But which is more dangerous: captivity or escape?.