In the Season 4 finale, Mary's work interferes with Brandi's wedding when Mary is forced to look after her least favorite witnesses.

Mary protects a courtesan from a gangster, who's the father of her unborn child. While Mary gets a crash course in childbirth, she must also decide if she can trust the woman.

Mary protects a deeply remorseful Army veteran and clashes with his military lawyer.

Marshall and Stan contend with a rock-star witness and her controlling mother while Mary is away on a WITSEC-mandated road trip.

A man is forced to enter WITSEC because of his twin brother's actions. Mary must protect them both from outside enemies and from each other.

Mary counsels a divorcing couple in WITSEC in order to keep their family safe. To help her cause, Mary must learn about Hindu tradition in hopes of guiding the pair to work things out.

Mary helps a terminally ill man reconnect with his estranged children.

Mary protects an Amish witness who must contend with culture shock and people who mean her harm.

Mary reluctantly teams up with a remorseless con artist to go after an even bigger criminal.

Mary counsels a teenage pageant queen who discovers she has been unknowingly living under witness protection.

A witness's romantic entanglements with a suspect fluster Mary, who acts as a go-between for the pair.

Mary helps a paranoid whistle-blower connect with his son.

Mary seeks help from a witness to help clear Brandi of grand theft auto charges in the Season 4 premiere.