Isabella Stark is Tony Starks twin sister and they don't get along. Isabella also has first hand experience with Hydra. So what will happen when Nick Fury sends her to help the avengers with a mission that unknown to them I Hydra. Swearing and Violence Mention of drinking, Smoking and drugs Only characters i own are Isabella Stark and some Villains that aren't in the movies. By the way this is my first story so sorry if it's not good.