Turn_of_the_key
Ruth Ware knows what she is writing. She knows what came before. And she hints about it. Even the title is a nod to Shirley Jackson.
She even quotes the opening sentence from The Turn of the Screw
in her book.
She also quotes Agatha Christie (who quoted Shakespear - I think) with the sentence about the quantity of blood.
Is it a good book?
No. It’s OK.