From In the Shadows, She Calls

After the events involving the Accords, Natasha Romanoff has lost everything - her closest friends sided against her, the team has broken apart, her home as she goes into hiding, not sure who to trust. With no other options, she goes back to work, using her very specific skill set for good. Nightmares and doubts plague her until she remembers why she left the Red Room in the first place.