The Forgotten Cases of Sherlock Holmes by Anon

Casus Oblitus Sherlock Holmes

https://www.waterstones.com/book/the-forgotten-cases-of-sherlock-holmes/anon/9780993145384

I'm a fan of Sherlock too.

The Adventures of Sherlock Holmes was the first regularly scheduled radio show (starting in 1930) that wasn't news/weather/sports or music. You can listen to them here https://archive.org/details/sherlockholmes_otr

Many where written based on the Conan Doyle works, some were novel, written in his style. Some of those were published as The Forgotten Adventures of SH https://www.amazon.com/Forgotten-Adventures-Sherlock-Holmes-Original/dp/0786715871

..and then there's Laurie King's The Beekeepers Apprentice, a mystery novel written  with a retired Sherlock as a character. https://www.amazon.com/s?k=beekeeper's+apprentice&language=en_US&adgrpid=1229254326708420&hvadid=76828561035275&hvbmt=bp&hvdev=c&hvlocphy=106632&hvnetw=s&hvqmt=e&hvtargid=kwd-76828646058603%3Aloc-190&hydadcr=18624_13575921&tag=txtstdbgdt-20&ref=pd_sl_2yl6m6tk9d_p

In Conan Doyle's SH works, there are frequent references to cases never published by Watson. Later authors have used their imaginations to fill in details. https://www.bestofsherlock.com/ref/untlist.htm

Like our dear poet Vergil, Sherlock retired to a rustic life keeping bees.