In a covert Romanian facility, Erik Heller evades security to rescue baby Hanna. 15 years on, father and daughter live deep in the Polish forest. Erik has trained Hanna to be an incredible killer and hunter. Yet, keen to grow beyond the boundaries of her isolated world, she begins to venture away from home. This attracts the attention of CIA agent Marissa Wiegler, who has hunted Hanna since birth.

Marissa is imprisoned in The Meadows whilst Hanna is encouraged to embrace her new identity as Mia Wolff. But doing so requires grieving for Erik, which Terri helps accelerate. Marissa escapes and convinces Hanna to leave, only for Clara to get in their way. Clara shoots Marissa and tells Carmichael that Hanna did it to stop Marissa from kidnapping her. Hanna is accepted back into The Meadows.