Hong Chau — the Oscar-nominated actor, who’s appeared in “The Whale,” “The Menu,” and “Downsizing” — is an interesting element on Netflix’s new series “The Night Agent,” and a revealing one. To cast Chau, a gifted and hardworking performer who’s been elevating projects for years, is to announce a certain ambition. Here, she’s playing the determined White House Chief of Staff, a figure close to the heart of various intrigues on a political thriller with schlock in its DNA. And yet she does it so elegantly, so excellently that she elevates the whole thing.

So it is with “The Night Agent,...