Took longer to grip me than the others in the series but one it starts going it GOES! McFadden can write a twist like a mother fucker and this book is no different, it shocked me the most out of the three. So good. Literally read most of it in one sitting because i just had to get to the end. 
It ties everything up really nicely Id be happy if this was the last Housemaids book, if there is a forth id want a 2.5 set before this one that explores what Enzo and Millie did while working with Benny. He's such a fun character and didn't get enough page time! Classic good cop in a bad system, grizzled and willing to bend the rules.

I genuinely didn't see the Ada twist coming at all! McFadden puts so much information in her books that it overwhelms you. it's needed because you know a twist is coming and when there's a bunch of factors your remembering it's harder to guess at what could happen accurately. But she pulls it all together in the the third act, even with the Housemaid-patented midway twist that completely changes the way. you view everything else so fair

also bringing back Cecelia was such a move! such a good callback and a great way to bring the series full circle