This was a bit of an infill since I started reading this a few days ago and said “Wait I’ve read this fantastical mystery set in a bell foundry before.” No idea why I failed to write it down at the time. Read it in the last year or so. It’s the next installment in the Rivers of London series and we’ve seen the protagonist cop become a detective and try to sort out the maniacal supernatural dude who has it in for him. Did not read it all the way through a second time.