'Person Of Interest' Season 4 Spoilers: Will Jim Caviezel, Michael Emerson Lose "The Cold War?" [WATCH]

Season 4 of Person of Interest returns from its short break with an all-new action-packed episode on CBS. Now that Shaw (Sarah Shahi)'s cover has been blown and a violent mob war is underway, will Reese (Jim Caviezel), and Finch (Michael Emerson) lose to Samaritan in 'The Cold War?'

As we previously mentioned, The Machine was beaten by a much more powerful Artificial Intelligence, known as Samaritan. To stay hidden from Samaritan's growing radar, Finch (Emerson) and his group assumed normal, regular lives to prevent themselves from getting caught. The stakes are even higher now that Shaw's cover was unexpectedly discovered by Samaritan.

Before going on hiatus, in The Devil You Know, Reese (Caviezel) and Finch (Emerson) had to rescue Elias (Enrico Colantoni) from his rival, Dominic. Though he was able to beat Dominic at his own game, Elias lost one of his closest friends in the process. Elias promises to go to war against Dominic, but if Reese and Finch get in his way, their alliance is over.

Check out the preview here:

According to TV, Samaritan attempts to shows its full power by erasing crime from the city for a day. This is an attempt to force Team Machine, especially Shaw to come out of hiding. In the footage, a mysterious stranger, Jeremy Lambert, winks at the camera and says, "I have a message for the Machine and his agents, Samaritan says, 'Hello.'"

As the promo states, this is the first part of an epic trilogy. The last time the show creators had a trilogy, Joss Carter (Taraji P. Henson) lost her life in the crossfire. Will Team Machine lose another member?

Check out this sneak peek here:

We also mentioned actress Blair Brown (Fringe) will make an appearance on POI as Emma on the 14th episode, airing in February. Her character is described as "an elegant and warm former public school teacher." Forced into early retirement, Emma receives a jury summons that teases the promise of some excitement back into her life.

Person of Interest returns December 16, Tuesday, on CBS at 10pm. Readers, are you excited to see part one, The Cold War?