Without detracting from the other reviewers, and in the knowledge that there's without a shadow of a doubt people that adore this kind of novel, but I'm afraid I simply don't.
How come? First off, no setting could be more suited than Victorian London for this kind of novel, but I felt that Anne Perry made little use of that. I never got the sense of almost 'being' in London at the time (contrary for instance to Sarah Waters' Fingersmith). Secondly, what annoyed me no end was the characterization of the protagonists: they are so decent, good, courageous, modest, self-effacing and what have you to be rather saintly than human. Believable characters are neither wholly good or bad but - as with all of us - have a bit of both in them. And lastly, the language used by the lower class types in the book ("I dunno nuffink", that kind of stuff) doesn't work, it's just got on my nerves.
So, as I said: not my cup of tea.