Luna is no ordinary puppy. Always drawn to the unknown, she finds herself facing a true test of courage when a dark force known as the Shadow threatens the magical Wellspring. As the source of all magic, the Wellspring is losing its power, and the balance of the world is at risk.

Joined by Rowan, a young warrior, and Evelyn, a clever sorceress, Luna sets off on a perilous journey filled with ancient secrets, deadly trials, and magical creatures. Inspired by the legendary tasks of Hercules, Lu...

In this brilliant sequel to Clockwork Boys, old foes resurface, and Slate and Caliban are forced to deal with the echoes of their past choices. From New York Times bestselling, Nebula and Hugo Award-winning author T. Kingfisher.