Jessica McCarney, better known as Jessie, is a Department of Homeland Security agent. Her expertise is in computers and electronics rather than fieldwork and combat. An introvert in the classic sense, Jessica likes to keep to herself and buries herself in her work and computers, spending more time concentrating on cases than personal relationships. She's extremely "book-smart" and knows a lot of stuff, but her lack of social skills can get her in trouble from time to time.