Storm Shepherds in Aenir, Adras and Odris spent their time guarding the sacred places of the spirit world. They used their cloud-bodies to float, rain, and fly, and were generally quite content.

Then they met Tal and Milla, a Chosen boy and an Icecarl girl. Tal and Milla had broken the rules of Aenir, so Adras and Odris had no choice but to punish them . . . with death. But Tal and Milla were different from other humans the Shepherds had encountered, and in a stranger turn of events Adras and Odris became their free Spiritshadows instead.

Now Adras and Odris have been torn from the only world they've ever known, sent on a nearly impossible mission to save the Castle.

And unfortunately, being a Spiritshadow, even a free one, takes a lot of getting used to. . .