Surely you must have read it by now?
To start us off, I think the thing that struck me most reading it back to back with Black Moth was how exactly she'd transposed the characters from BM. Andover's conventional best friend, his frivolous brother and sister, his boring brother-in-law, the woman he abducted, and her husband (complete with watered-down highwayman past) are all there, just as before, and it makes the melodramatic plot of These Old Shades infinitely more fun.