The past and the present blur as Alex dreams of lives and times not her own. With the magically bound Fae still out for blood, the mages need a way to break the spell. Merlin seeks Mjǫllnir, the Iron Hammer forged by the Iron Soul incarnation Thor. Driven by her dreams, Alex and her friends travel to Paris to search for the Iron Hammer and unravel the mystery of its past while waiting for Arthur's next move.

Long ago, the young mage Thor seeks to understand the strange magic he wields and the mighty hammer he has created. His feelings for the Old One Sif and the continued danger of the Dark Elves complicate his once simple life. In World War II, a German professor is pulled into the Nazi party and their quest for power. He faces strange visions of the past and a heartbreaking choice. They share the same soul and a connection to the Iron Hammer, but their lives take very different directions as both seek to protect their world.