Question (Patreon)

My brain, it not functioning so good this AM. This is about my Synne City series.

I thought of a possible follow up for a villainess I used in a story. She was a one shot, a former English heroine captured, forced into prostitution, and then free to continue as a hooker in the Tenderloin. But she got a device to KILL voids, and became a villain. 

Does anyone remember what book that was? For the life of me I cannot remember. I think named her "Kate" since I visualized her as Kate Beckinsale.