Black Bag' screenwriter David Koepp on polygraphs, Severus, the second-act plot twist, and why spies he met couldn’t maintain ...

In Steven Soderbergh's "Black Bag," Michael Fassbender plays a British double agent whose lover (Cate Blanchett) might also be a turncoat.

The movie, which was only in theaters for a limited release in 2011, is available to stream on Netflix and has a runtime of ...