In the genre of "erotic thriller" it is typically the male that is portrayed as the cheating spouse who gets caught up with the femme fatale.
Here, the role is reversed... it's the middle-aged career woman seeking sexual satisfaction outside her marriage with a younger co-worker.
Despite what some reviews here suggest though, this is not an audacious concept. It has been mined in such movies as Unfaithful and Ryan's Daughter.
And for a movie being marketed as an erotic thriller/mystery, there's none of that here. It's just a straight up drama more in the vein of 9-1/2 Weeks than movies such as Fatal Attraction or Body Heat.
There's a hint of what could have been in just one scene where Kidman's philandering corporate officer and her younger lover threaten each other with exposure. Which of them has the better ammo? We'll never know because the subject is never broached again.
Kidman deserves nods for leaning hard into her role as the unsatisfied wife who has kept a lid on her darker desires during the course of her marriage. Unfortunately, the younger man she takes on, Harris Dickinson, is no match for her. He doesn't have the gravitas or screen presence to suggest that Kidman's character would be at all interested in him.
An okay one-of watch for Kidman's performance.