After falling into the chasm Vanya Romanova and Bucky Barnes are intercepted by the leader of the KGB who used to watch over Vanya as a child. Now dealing with the revelation of who her father is and struggling to get away from KGB to confront her mother there is a lot going on behind the scenes, a deadly enemy from the past is ready for vengeance and it's up to Vanya to stop him.

When Natasha Romanoff discovers she's pregnant she uses a lengthy mission to cover it up and gives the baby to an orphanage so the child can live a normal life. The Red Room adopts Vanya Romanova pressing her through torturous training. Now Vanya's the Black Mamba of HYDRA. When she discovers S.H.I.E.L.D. will she continue on a path of destruction or will she change her alliances?