When does Person of Interest return?

Person of Interest is an American science fiction crime drama television series that aired on CBS from September 22, 2011, to June 21, 2016. The series centers on a mysterious reclusive billionaire computer programmer, Harold Finch, who has developed a computer program for the federal government known as the Machine. Finch hires John Reese, a former Special Forces soldier and CIA operative, to be his field agent in preventing small everyday crimes. The show won the 2012 People's Choice Award for Favorite New TV Drama.