The moral compass. Unlike the boys, Carter plays by the book—until the book fails her. Her hunt for "the Man in the Suit" turns into an uneasy alliance. Henson grounds the sci-fi elements in brutal reality.
If you want to focus on the overarching plot and character development, these are the most "interesting" and critical episodes of Season 1: person of interest complete season 1
Sets the stakes and the unique visual language of the show. Witness (1x07): The chilling introduction of Elias. The moral compass