Vivienne stark younger sister to Tony Stark has been living in Hydra since her mom and dad died. she been trained as the Acher killer. When she is given in the task to being back Brain Kaiser back to hydra, she is ready to comply. going undercover into the avengers but everything is not what it smees the more she spends with the avengers. the more she family but if she doesn't complete her task there will be consequences. I only Own Vivienne and Kai and any other characters I make All of the other characters belong to Marvel Book 1 Marvel AU