A Fatal Assignation — Alice Chetwynd Ley

When Sir Aubrey Jermyn turns up dead in a Bond Street modiste's inner sanctum, the team goes into action. Unsavory details about Jermyn's womanizing and pandering emerge with a cluster of likely suspects more than willing to wreak vengeance on their abuser. While witty Anthea and scholarly Justin Rutherford carry on mild flirtations in their social rounds, they piece together the events leading up to Jermyn's fatal assignation with his neighbor's wife.
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Severn House (UK) Hardcover:

'Curiosity was an integral part of Miss Andrea Rutherford's character. She could no more resist exploring an intriguining situation than a bee could be restrained from gathering honey. It was because of this regrettable tendency that she first became involved in a mystery concerning a well known gentleman... who was also an intimate friend of no less a personage than the Prince Regent.'

When Sir Aubrey Jermyn disappeared. Lady Amelia Jermyn simply could not go to the police - one had to avoid any sort of scandal. The only thing to be done was to call upon the help of the Honourable Justin Rutherford - he had, after all, successfully solved the late Marmaduke Yarnton's muder. But it was Justin's niece, Anthea, who quite unwittingly stumbled upon the first clue in what was to become a most extraordinary and intriguing murder...