If you find TV sex scenes embarrassing, this is not the show for you. Otherwise, it’s difficult to see why you wouldn’t be gripped by this steamy four-part psychological thriller, based on Louise Doughty’s novel.

Emily Watson stars as Dr Yvonne Carmichael, a married, middle-aged scientist who thinks the highlight of her day will be speaking at the Select Committee at the House of Commons.

Little does she know she’s about to bump into a mysterious, handsome stranger in the corridors of Westminster, who instantly seduces her and with whom she is about to start a reckless affair.

And the drama doesn’t stop there… Tense, bold and startling.