The hype around A J Finn's new psychological thriller, The Woman in the Window, is extraordinary. Stephen King calls the book "remarkable", and Gone Girl author Gillian Flynn says it's "astounding". The movie rights were bought before the ink had dried on the story of the agoraphobic Anna Fox, a child psychologist who sees something nasty happen to one of her neighbours from the window of her New York home. Since its release, The Woman in the Window has been sitting atop the New York Times best-seller list - extraordinary for a debut novel. AJ Finn, who quit his day job as a book editor, talks about the book - and one of his favourite crime writers of all time, Dame Ngaio Marsh.