Belgrave Square — Anne Perry

When an obscure moneylender named William Weems is murdered in the humble Clerkenwell district, there are no mourners and more than a little discreet rejoicing among those whose meager earnings he so mercilessly devoured.

Yet when Inspector Pitt finds a list containing the names of some of London's most distinguished gentlemen in the murdered man's office, he begins to measure the magnitude of the job he has been given. William Weems was no common usurer, but a vicious blackmailer. Fortunately, Pitt's clever, well-born wife, Charlotte, has entree to London's best society. And at glittering balls and over gossipy tea tables, she observes a world of passion, power, and greed that the police are seldom permitted to see....