Thor and Loki's infant baby sister waa kidnapped 19 years ago. 5 years later Tony Stark finds and saves a scarred little girl from a Hydra base. Tony adopts her as his own. Now present day she meets the avengers and Loki and Thor feel. like they know her. Is she thier sister? What did Hydra do to her? Will she join the team or decide to lead a normal life?