The Housemaid

I read this for a book club, and I enjoyed it. 
On the surface, I thought the way this was written was compulsively readable. It did some things I had never read before in a thriller, even though I have read that it is very similar to another. (I hadn't read it). Personally the change in perspective, even with the novel being first person, was a real surprise for me. 
The plot itself is a little slow for me though, so when the climax finally came crashing in, it felt oddly short. The main character was also a bit unlikable, which comes to a head for me when the character does something I personally find despicable, then the novel has no one really likable in it at all. 
Why does the new housemaid's bedroom have a lock on the outside of the door, not the inside? Read it and find out! Personally a 3/5*. 

“Those were my books, and you didn't treat them very well, did you?” This is the best quote of the book, please enjoy it very out of context.