In the series finale, Mary feels torn between a witness and her family, who gather for an unexpected reunion. Elsewhere, big changes occur at the WITSEC office.

The FBI keeps an eye on Mary after her father goes on the lam seeking vengeance. Mary tries to lose the agents tailing her in order to track her father down herself.

Mary's fugitive father surfaces, putting Jinx and Brandi in danger and leaving Mary to wonder whom she can trust.

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.