Production started on 4 May in Los Angeles after Sony Pictures Television secured a $31.6m California tax credit to move filming from New York.
Netflix renewed the spy drama despite weaker Seasons 2 and 3, saying fan interest remained and executives rated Season 3 highly enough to support a planned ending.
Creator Shawn Ryan said the final run is designed to give Peter Sutherland a definitive conclusion, with Titus Welliver, Trevante Rhodes, Li Jun Li and Elizabeth Lail joining Gabriel Basso.
How will the new characters and Los Angeles setting reshape the show's final chapter, and could this influence future spy thrillers?
With viewership dropping, what risks and rewards come with ending 'The Night Agent' on the creators' own terms rather than chasing more seasons?
Could the success of 'The Night Agent' and its tax-credit-driven move to LA spark a trend of more high-profile series relocating for financial incentives?