Vicky Van

A man is stabbed at a supper party in a fashionable little house just off Fifth Avenue, and the hostess — young, charming, known to everyone and to nobody — walks out of the room and is not found. Wells lost most of her hearing to scarlet fever at six and turned out roughly a hundred and seventy books; she wrote detective stories to rules she codified herself, and the solution here depends on a fact hidden in plain sight from the first page.