Tirek still lives, and we want him back. He will lead us unto a new order, he will make everything right. Weather you like it, or not.
Years after Tirek was defeated, his followers were still angry. They were mad at Twilight, Equestria, and especially Celestia. So one night, they decide to take action.
Thorn is a highest ranking guard in the Royal Army. He is certain that nothing can take that away from him. But, one thing he sees during what he assumes a normal court case, he'll regret it for the rest of his life.
Now he is taken hostage, and put in a POW camp. Now he needs to get out. But he'll learn nobody on the outside really care about him.