When I was in my early teens I devoured every bit of the Sherlock Holmes opus, all 4 novels and the 5 collections of short stories. In fact I think I read most of them twice! Since then I have read a few attempts to extend the series, some have worked quite well (e.g. The House of Silk by Anthony Horowitz) and some have fallen short.
Elementary by William Todd comprises “4 mysteries from the case files of Sherlock Holmes” which Dr Watson had not published. It didn’t work for me, it felt formulaic and somewhat predictable. To be honest I couldn’t bring myself to read all 4 of the stories, 2 were more than enough!
Unless you have read and remember all of the original Conan Doyle stories you might do better to go back to the originals and even if you do remember them I would still rather read the originals again than these wooden homages.