The Angel of Terror by Edgar Wallace

That night the "grisly Jaggs" was later than usual. Lydia heard him shuffling along the passage, and presently the door of his room closed with a click. She was sitting at the piano, and had stopped playing at the sound of his knock, and when Mrs. Morgan came in to announce his arrival, she closed the piano and swung round on the music stool, a look of determination on her delicate face.

"He's come, miss."