Is The Undoing properly great or just a run-of-mill thriller with a brilliant casting director?

There must be some people somewhere who vaguely know their own spouses — but if so, they don’t tend to appear in domestic-based thrillers. Last week when Sky Atlantic’s The Undoing began, Jonathan and Grace Fraser (Hugh Grant and Nicole Kidman) seemed to have the happiest of middle-aged marriages. They still laughed at each other’s jokes.