Who is Lucinda Watt from The Haunting of Alaizabel Cray and what is their importance?

Lucinda Watt is Dr. Pyke's secretary. She is a severe woman, dedicated to her job, and she does not realize that Inspector Maycraft finds her attractive. She is a member of the Fraternity. Stitch-face tortures her for information about Dr. Pyke, the chackh'morg, and the Fraternity, then he kills her.