Shadow Heart is an assassin of the highest grade. A being that runs through the darkness and can call upon the shadows to aid him in his contracts. When the Queen calls upon him the last thing he expects is for her to inform him that he has overstepped his bounds and that he is to be banished till he atones. Atones for what? Before he can ask he is sent to the Realm of Light and must come to terms with a world that does not know of darkness. How can a pony that has been cursed to the dark depths find anything in the light?