The fourth season kicks off with Annie (Piper Perabo) and Auggie (Christopher Gorham) adjusting to their new romance and how it changes their working relationship. Annie also navigates an uneasy partnership with Henry Wilcox (Gregory Itzin), who gives her shocking information about Arthur (Peter Gallagher). Joan (Kari Matchett), forced to endure the fallout from the scandal involving Arthur, receives surprising news that complicates things further. Hill Harper joins the cast as Colombian station chief Calder Michaels.