In Plain Sight is an American drama television series that premiered on the USA Network on June 1, 2008. The series revolves around Mary Shannon, a Deputy United States Marshal attached to the Albuquerque, New Mexico office of the Federal Witness Security Program, more commonly known as WITSEC. Shannon must find ways to balance her professional life of protecting witnesses, her professional relationship with her work partner, US Marshal Marshall Mann, and her problematic personal life. The show was filmed on location in Albuquerque. In Plain Sight concluded on May 4, 2012, after five seasons.

Mary Catherine McCormack is an American actress. She has had leading roles as Justine Appleton on the series Murder One (1995–1997), as Deputy National Security Adviser Kate Harper on The West Wing (2004–2006), as Deputy U.S. Marshal Mary Shannon on In Plain Sight (2008–2012), and as Peggy on the comedy series The Kids Are Alright (2018–2019).