There's a whole world out there and it isn't ours! The words of her mentor inspire Kali Hooper to explore the lost places of Twilight, unearth the secrets of the past and discover the fate of the vanished Old Races. So far, so good. But when an unexpected encounter in the deadly Spiral of Kos brings Kali head to head with Twighlight's all-consuming Final Faith, she finds herself in a race for the keys to the Old Races' most terrifying secret yet, the mysterious construct known as the Clockwork King of Orl.