A marshall who watches over federal witnesses in New Mexico, Mary Shannon (Mary McCormack) faces more tough tasks this season as she endeavors to treat mob informants and other lowlifes just like innocent bystanders -- all while maintaining her own secret identity. Complicating Mary's life is her difficult partner, Marshall Mann (Fred Weller). Lesley Ann Warren, Nichole Hiltz and Cristián de la Fuente co-star in this USA original series.