Neve & Fletcher are married with children. BUT, Neve is having an affair with Saul. AND, Fletcher is having an affair with Sarah.
Neve enters Saul's apartment & finds him dead. He's been bludgeoned to death with a hammer. She attempts to remove every single trace of herself from his apartment. Did she leave something vital behind? What if someone saw her leaving the apartment? Are there CCTV cameras filming her comings & goings?
The police question her about her relationship with the deceased; when she last saw him, whether she noticed anything odd about his behavior, had she ever been to his apartment? Neve conceals her involvement with Saul. She lies to the police. She lies to her husband. She lies to her friends. Every word a fabrication.
How strange it is that his widow wants to speak to Neve the morning after her husband has been found murdered. Her dead lover's wife informs Neve that she suspected that Saul had been having an affair. Did he really need an apartment, when he could get home in less than an hour? She knew from the start what it was really for.
It turns out that whoever killed Saul had intended to kill Neve. Saul had died because of her. Someone had meant to kill her. Saul was just collateral damage. He had stumbled into a trap that was meant for her. Who might have wanted to kill HER?
There's SOOOOOO much minutiae. I don't care what items she bought at the grocery store. Or what she served for dinner. Or the MANY times she has to feed their Guinea pig. Or the MANY times she reminds her boys "to clean their teeth". Or the endless cups of tea she drinks.