Prologue:

One month has passed since the events of Frozen:Hans Revenge. Peace has returned to the land of Arendelle. However, a greater, more powerful evil has been watching from the shadow. Grisson, Prince of Shadow has set his eyes on Arendelle. With his powers of shadow and dark, he hopes to throw Arendelle and the royal family into a time of darkness. He has also taken a liking to a member of the royal family and hopes to make her his own. And when Elsa learns of a location that could reveal to her where her powers came from, she embarks on a quest to discover not only herself, but her destiny.

Disclaimer: I do not own Frozen, All characters shown (Except Grisson) are own by the Disney Corporation.