The Reaper is back and Grimm is not what he seems.

Surviving the attack of the Reaper, Grimm and Blayz are sent by Sensei Tenzin on a quest to find the witch Leetah so she can help Grimm understand the mark of the Dark One that has appeared on his arm after he touches the Dark Stone.

Will they be able to find her and survive her Iron Golem guards?
Will Leetah help Grimm find his purpose and discover his true identity?
Or will she destroy them, thinking they are common thieves?