“ 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.

Cate Blanchett and Michael Fassbender play a high-ranking spy couple in Steven Soderbergh's new film. Black Bag offers Bond-style globe-trotting intrigue and marital dramedy.