Person of Interest Season 4 Episode 11 [If-Then-Else] br Airs : Tuesday, at 11:00pm br Network : CBS br {Drama} {Action} {Adventure} {Mystery} {Thriller} br Actors : br [Jim Caviezel] as [John Reese] br [Michael Emerson] br [Sarah Shahi] as [Samantha Shaw] br [Amy Acker] as [Root] br Episode Plot: br Samaritan launches a cyber-attack on the stock exchange, forcing the team to risk their lives in a desperate mission to stop a global economic catastrophe.