It's the new Hilary Mantel novel. She's probably more of a big thing over here in the UK - one of those rare properly famous writers.I think about this all the time. In print media, at least, overconfident mediocrity abounds. All the more evident without the fine-tuning of a dedicated subs bench
A had to google the Mirror and the Light. Maybe it's a Brit thing?
I suspect CM and SH grew up in "genteel poverty" - well connected, possibly upper class parents who nonetheless weren't very well off.
SH had talked about this I'm sure - doesn't she mention hanging out with Leigh Bowery when she was younger?