The NCIS team joins forces with the NSA to find the creator and controller of a software program linked to a cyber attack against the Department of Defense.

Absent from the office is Hetty. She's recuperating outside the office and having Nell do her work. And Nell proved more than up to the task.

Meanwhile, Callen continues searching for more information about his past, butting heads with Hunter and ultimately tracking down Hetty.

He won't open her file on him, however, as it is meant only to be opened in the event of her death.