11-year old Norse demigod named Mary Martinez doesn't know anything about being what she is. That changes when, one day, a Norse goddess takes her to a camp for people like her. There, she meets a group of new, hilarious friends. Life is going great for her. That, however, changes when she is sent on a mission to find and kill an escaped soul from Helheim that isn't what he seems. Soon, Mary begins to suspect someone of killing the escaped soul and she thinks the same may happen to a friend of hers. They plan to bring it up to the potential murderer, in whichever way they must.