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. In Plain Sight also stars Frederick Weller, Nichole Hiltz and Paul Ben-Victor. Guest stars for season four include Josh Malina, Bradley Whitford, Rachel Boston, John de Lancie and Ali Marsh, among others. In the upcoming season, Marshall (Weller) will have a new love interest (Boston); Brandi (Hiltz) gets engaged to Peter (Malina), and Mary reluctantly helps plan the wedding.