To this day I can't decide whether or not I believe that Ben Aaronovitch lost his manuscript for So Vile a Sin in a hard drive crash, or whether that was just an excuse for the fact he hadn't actually written it. In either case, when it finally appeared written by Kate Orman, it was a bit of a let down (I felt). It's big event was already spoiled because we had read the books that came after and to be honest, didn't feel entirely earned.