I've now read
Mary Rose, which is one of the books I nominated, and, for what it's worth, I was mildly disappointed. It was OK, with some scary scenes, but somehow not quite scary enough. This is a book based on J. M. Barrie's play, which Hitchcock wanted but failed to film, and included an afterword about that.
I am now listening to
A Head Full of Ghosts, which I also nominated but which did not make it to vote. I like this one a lot better, at least so far; I've still got about a third of the book to go, so there's plenty of time for it to go pear-shaped. But I live in hope.