Chapter 1: How it started

Queen Elsa of Arendale finally learns how to control her powers and life in Arendale goes back to normal- mostly. but what happens when one day Elsa receives a strange letter from an old enemy and has to confront a new one. she than sets on a journey to save Arendale but will she be able to do it alone?
(I do not own any of these characters except My OCs. the rest are all property of Disney and Dream works.)