A Murderous Relation by Deanna Raybourn

Veronica Speedwell and her natural historian colleague Stoker are asked by Lady Wellingtonia Beauclerk to help with a potential scandal so explosive it threatens to rock the monarchy. Prince Albert Victor is a regular visitor to the most exclusive private club in London, known as the Club de l'Etoile, and the proprietess, Madame Aurore, has received an expensive gift that can be traced back to the prince. Lady Wellie would like Veronica and Stoker to retrieve the jewel from the club before scandal can break.

Worse yet, London is gripped by hysteria in the autumn of 1888, terrorized by what would become the most notorious and elusive serial killer in history, Jack the Ripper--and Lady Wellie suspects the prince may be responsible.

Veronica and Stoker reluctantly agree to go undercover at Madame Aurore's high class brothel, where another body soon turns up. Many secrets are swirling around Veronica and the royal family--and it's up to Veronica and Stoker to find the truth, before it's too late for all of them.

This book is part of the "Veronica Speedwell" series.
Here are some other books from this series: