As if Decima and Vigilance weren't enough for the Person of Interest team to handle, there's also the lingering threat of Finch's mysterious caller from this season's "Last Call" episode. So will he be calling Finch again? EP Greg Plageman gave the spoilers to TV Line:
“Oh, I’m certain he’ll resurface. But whether we actually see him again this season… you will not.”
Who do you think this new enemy is?