Mary Shannon is a U.S. Marshal in the witness protection program who spends her time relocating federal witnesses.. Based in Albuquerque, New Mexico, Mary works with her partner, Marshall Mann, to place criminals and innocent witnesses into new lives. When not putting her life on the line to protect federal witnesses, Mary attempts to manage her dysfunctional family, including overly dependent mother, Jinx, and younger sister, Brandi, both of whom live with her. Between work and family, Mary has little time for boyfriend Raphael Ramirez who plays minor league baseball.
Cast: Mary McCormack, Frederick Weller, Paul Ben-Victor, Nichole Hiltz, Lesley Ann Warren, Cristián de la Fuente
In the series finale, Mary finds herself caught between her "model" witness and an unexpected family reunion, while radical changes take place around the WITSEC office.
Mary must clear her name by finding her father. However, to do so, she must lose her FBI tail.
Brandi and Jinx are put in danger when Mary's father (Stephen Lang) returns.
Mary helps a drag queen stay out of trouble, while Marshall takes part in an undercover sting.
Mary looks after a bigamist, who's hiding from his former employer and his two wives.
Mary and Marshall turn to a Native American detective to help them track down a witness who's hiding on an Indian reservation.
Mary scrambles to find child care while working on a case in which a hoarder witnessed a violent murder.
Mary returns from maternity leave and encounters a new dynamic at the office in the Season 5 premiere. Elsewhere, Mary is assigned to protect a witness who could destroy a powerful secret society.