Showing Pentecost Alley by Anne Perry

Inspector Thomas Pitt knows the murder of a prostitute in a bedroom on decrepit Pentecost Alley would normally cause little comment, but under Ada McKinley's body is a Hellfire Club badge inscribed with the name 'Finlay Fitzjames'. Finlay's father - immensely wealthy, powerful, and dangerous - denies the possibility that his son has been in Ada's bed. The implication is clear: Pitt must arrest someone else. But Thomas Pitt will not be intimidated, and with the help of his quick-witted wife, Charlotte, he stubbornly pursues his investigation, determined to expose the truth.