A dead witness causes Mary to take leave of her administrative duties to solve a "Ten Little Indians" story, until her plan gets changed by her own brand of Post-Traumatic Stress disorder.
A building collapses on one of Mary's witnesses, leaving him exposed to outside threats, so Mary has to risk her life in order to keep her witness safe.
An Orthodox Jew enters Witness Protection, but his wife refuses to join him. The situation is made more complicated by the fact he is being pursued by a man motivated by a higher authority.
When a series of murders seem to follow a new ex-con witness, including stabbing Mary's friend, she and Marshall have to figure out if he's the killer in time to save his next victim.
FBI agent O'Connor arrests Brandi on charges of drug trafficking and murder. Insisting her sister is innocent, Mary works to help Brandi while ultimately trying to discover O'Connor's real motive for his actions.
Mary briefs a new witness whose visitation rights with his son depend on the man's testimony. When Mary learns the boy is missing, she tries to find him.
The barely legal daughter of Mary's witness – a Miami racketeer – finds herself in a dangerous romance, just as Raph's mother visits to prepare an engagement feast for the surprised Mary.
Mary lends her expertise for the U.S. Marshalls by making a training video with a film crew. Elsewhere, Marshall prepares the arrangements so that an elderly mobster in Witsec can go to his son's funeral.