“ Black Bag ,” an elegant, quick-witted new thriller that finds Cate Blanchett and Michael Fassbender playing married spies, isn’t the pair’s first time together on screen. That honor goes to 2017’s “Song to Song,” one of Terrence Malick’s most intangible and head-scratching offerings — though the two stars can barely recall that experience.

It follows a group of employees at an intelligence agency, but where most spy films rely on action to further the plot, Steven Soderbergh’s latest film is heavy on fast-paced dialogue. Star Michael Fassbender told Yahoo Entertainment that when he read the script,