Person of Interest Spoilers: Mad Men's Cara Buono Joins Season 4

Person of Interest Spoilers: <em>Mad Men's</em> Cara Buono Joins Season 4

Cara Buono (Mad Men) landed a recurring role on the upcoming fourth season of Person of interest. 

Her character is described as a femme fatale who’s uniquely qualified to navigate the new world order of Season 4 of the procedural drama.

Person of Interest returns on Tuesday, Sept. 23 on CBS.