After a brutal attack exposes a ghost operative tied to the remnants of the Red Room, Natasha Romanoff and Yelena Belova come face to face with the impossible truth: their sister, Viktoriya Novik, is alive. Hidden for years under Dreykov’s control and reshaped into Natasha’s replacement, Tori has become one of the deadliest assassins in the world. But beneath the conditioning, violence, and reprogramming, fragments of the girl they lost still remain. As SHIELD and the Avengers race to dismantle the surviving Red Room, Natasha and Yelena are forced into a devastating choice: save their sister before there’s nothing left of her to save… or stop the weapon she’s becoming.