In Plain Sight returns for its fourth season, starring Mary McCormack as Mary Shannon, a U.S. Marshal working in the highly secretive branch of the witness protection program (WITSEC), who relocates Federal Witnesses, most of whom fall into three categories: career criminals, whistle-blowers or innocents who had the misfortune of witnessing a crime. They all have one thing in common - someone wants them dead. Mary's job is to see that doesn't happen, while at the same time attempting to manage her own dysfunctional family.
Mary uses a thief to catch a thief when she asks a witness to consult on a crime in order to exonerate Brandi of grand theft auto.
Mary must help a whistle-blowing witness reconnect with his son as he struggles with a severe case of paranoia. Unfortunately, when you're in WITSEC just because you're paranoid doesn't mean they're not out to get you.
Mary is forced to be a reluctant go-between in the WITSEC version of a witness Romeo and a suspect Juliet.
Mary helps a Miss Congeniality teenage pageant queen cope when she suddenly realizes that she's spent her entire life in the witness protection program — but didn't know it.
Mary learns that the only thing she despises more than protecting an unapologetic con artist, is having to team up with him in order to take down an even bigger dirtbag.
When Mary's witness is forced out of an Amish community and into WITSEC, learning to adapt is far from her only concern. Even a fish out of water has to worry about sharks.
Mary must help a terminally ill father heal a tarnished relationship with his distant children.
Mary plays marriage counselor in order to mediate a WITSEC divorce. Not only must she reconcile a stubborn witness, but also thousands of years of Hindu tradition, in order to save the case and keep a family out of danger.
Mary gets a WITSEC two-fer, when a witness is forced to enter the program after being mistaken for his "evil" twin brother. Not only must she protect the pair from their enemies, but also from each other.
When Mary's WITSEC mandated road trip turns into an introspective odyssey, Marshall and Stan are left to deal with a rockstar witness and her overbearing mother.
Mary helps protect a guilt-ridden army veteran, while butting heads with his JAG attorney. Unfortunately for Mary, things are further complicated by the return of her ex-husband.
Mary learns all the joys of childbirth while protecting a courtesan from the gangster that impregnated her. Although Mary may be immune to her charms, can a seductress truly ever be trusted?
On the day of her sister's wedding, Mary is flown to Miami in order to protect her least favorite witness from hired mercenaries.