Sherlock Holmes and the Musical Murders (2014)

The first volume of "The Final Tales of Sherlock Holmes" by John A. Little.

Holmes and Watson are plunged into the secret underworld of 1925 London, where a serial killer of musical (gay) men is afoot. The killer has a little list, and Sherlock is on it. Why? And what have the Bloomsbury Group and the Diogenes Club got to do with anything? Thanks to Royal Jelly, Holmes is a fit 71-year-old, who has lost his interest in bees and returned to detecting. He's not quite as sharp as he used to be, but he's still pretty sharp, and a bit of a vigilante in his old age. He meets up with his colleague and friend, Dr. John Hamish Watson, a 72-year-old not-quite-so-fit-at-all twice-widower, who hankers after the good old days of derring-do. They are joined by their excitable new housekeeper at 221B Baker Street, the brilliant, buxom Miss Lily Hudson and are helped in their work by Jasper Lestrade of Scotland Yard, the ambitious, respectful son of the late George Lestrade.

Title: Sherlock Holmes and the Musical Murders
Author: John A. Little
Year: 2014
Publisher: MX Publishing
Purchase: Amazon.com | Amazon.co.uk

The Adventure of the Peculiar Protocols (2019)

A new Sherlock Holmes novel by Nicholas Meyer is headed to bookstores in October 2019. The Adventure of the Peculiar Protocols will be Meyer's fourth Holmes outing following The Seven-Per-Cent Solution, The West End Horror, and The Canary Trainer.

With the international bestseller The Seven-Per-Cent Solution, Nicholas Meyer brought to light a previously unpublished case of Sherlock Holmes, as recorded by Dr. John H. Watson. Now Meyer returns with a shocking discovery―an unknown case drawn from a recently unearthed Watson journal. 

January 1905: Holmes and Watson are summoned by Holmes' brother Mycroft to undertake a clandestine investigation. An agent of the British Secret Service has been found floating in the Thames, carrying a manuscript smuggled into England at the cost of her life. The pages purport to be the minutes of a meeting of a secret group intent on nothing less than taking over the world. 

Based on real events, the adventure takes the famed duo―in the company of a bewitching woman―aboard the Orient Express from Paris into the heart of Tsarist Russia, where Holmes and Watson attempt to trace the origins of this explosive document. On their heels are desperate men of unknown allegiance, determined to prevent them from achieving their task. And what they uncover is a conspiracy so vast as to challenge Sherlock Holmes as never before.

Title: The Adventure of the Peculiar Protocols
Author: Nicholas Meyer
Year: 2019
Publisher: Minotaur Books
Purchase: Amazon.com | Amazon.co.uk