The fic I'm looking for has a scene where Darcy is taken by SHIELD, who no one knows have been infiltrated. She's held in an office, where she manages to phone Tony and the gang. Clint and Natasha infiltrate the SHIELD HQ to get her out.
I think this is only a small part of a much larger fic, but I can't remember what else happens. I've been looking for a long time, and would appreciate any help!