They saved Aiden, but Arthur is still out there, and fae creatures have gone mad. Ravenslake is under attack from beings that have lived peacefully on Earth for thousands of years. Alex wasn't supposed to be the hero, but she must step into the role. The responsibilities of guarding the Iron Realm, leading the mages, rebuilding her friendships with Jenny and Lance, and protecting her family have landed on Alex's shoulders. Strange dreams aren't making things any easier. But, as the pieces fall into place, Alex learns that not all past incarnations of the Iron Soul have been good.

In the past, the Sídhe haven't given up on taking the Iron Realm, but their latest efforts have twisted the magic of the Iron Gates. Corrupted Sídhe known as Dark Elves, threaten the villages of ancient Norway. A young man named Thor with magical powers steps forward to save not only humanity, but the Old Ones and the peaceful Sídhe regardless of what Merlin and Morgana have to say.