Edward's father works at Grimsrud Fortress, where a crypt has just been discovered. But before they managed to open the grave, the fortress began to collapse and had to be shut down.
Edward and Kasper realise that something supernatural is to blame, and go to visit the fortress in the dead of night. In the grave, the ghost of King Grimm is lying in wait, planning to wake up his old army to achieve what he never managed to do when he was alive – conquer Grimsrud.
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