I didn't realise before I started reading this that it was the third book in a series and I wish I had read those first! I don't feel like I needed to but I always think it's adds more background to the story.

Cecelia is a wealthy woman who has a five month old baby with her partner Evan. She throws him out after having enough of his laziness when it comes to looking after their daughter Peyton and finding out that he is having an affair with someone at work.

Cecelia was previously married to Paul, who is currently imprisoned, and he has now reached out to her via letter. I believe the previous two novels focus more on him so I will definitely be going back and reading those!

Meanwhile, Lizzie is the nanny for the Johnsons who live next door to Cecelia. Their children are teens and preteens and Lizzie is fed up with their spoiled attitudes and how the Johnson parents treat her. She has been watching Cecelia, eager for a nanny job with her and is delighted when Cecelia finally contacts her offering her the role of Peyton's nanny.

I remember reading Favourite Daughter by Kaira Rouda back in 2019 and I loved it. I felt the same reading What The Nanny Saw. Rouda is fantastic at popcorn thrillers, I flew through the pages, gripped from the beginning. I love unreliable narrators and dark female characters, add the amount of tension and you have a great thriller. I would definitely recommend!