Counterpart (2017)

J. K. Simmons plays a lowly Berlin office clerk and his harder, more dangerous double from a parallel world that split from ours during the Cold War. Justin Marks keeps the machinery to a single guarded crossing and spends his time on what one life would look like with different choices. The spy plotting is gripping, but the two Simmons performances are the reason to watch. It ran for two seasons and ends cleanly enough.