For those unfamiliar with this series, Inspector Pitt is a police detective in Victorian England, in the period shortly after the professional police force was first established. Policemen were respected to a degree, but apparently had about the same social status as a skilled laborer. Pitt's wife, Charlotte, on the other hand, is from a much wealthier and higher-status family. Indeed, Charlotte's sister is married to a wealthy and well-connected man who is being considered for a vacancy in Parliament. That connection enables Charlotte to participate discreetly in Pitt's investigations when they require a peek into the activities of society's upper crust.
The story: a sleazy loan shark is found shot to death in an unusually gruesome manner. Almost everyone who knew the man had good reason to want him dead. Even Inspector Pitt, who is assigned to investigate the case, can't avoid the feeling that the murderer did the rest of society a favor. But murder is illegal, and so the investigation goes on.
It quickly develops that the victim was not only a loan shark, but a blackmailer as well, with several socially prominent people on his list of victims. Hence the investigation must proceed delicately. And that's where (as usual) Pitt's wife, Charlotte, lends a hand.
If you are already familiar with Anne Perry's Inspector Pitt series, you know that she's one of the very best mystery writers around. Personally, I think Elizabeth George and possibly P. D. James are her only superiors in the field. It's hard to rank one book in the series against the others, but this one certainly upholds the high standards of the entire series. The characterizations are vivid and believable, the plot is complex and captivating, and the ending is logical and satisfying. My only complaint about the book (and it applies to all the Inspector Pitt books) is the constant obsession with differences in social class. Those differences existed in Victorian England, of course, but I find it hard to believe they were such a preoccupation in everyone's mind, minute by minute, day after day, as Perry makes them out to be. The class distinctions were more likely taken for granted, like the weather.
If you're a mystery fan and you haven't read any of Perry's work, then this is as good an introduction to the series as any. You're in for a treat.