If you're a stickler for accuracy in portraying Doyle's stories, this is not for you.
You have to watch both videos, parts 1 & 2, to see what's going on. It's slow, needs cutting, and the out-of-place, out-of-time characters thrown in make for very strange but funny plot turns. But it was good to see these stars. It helps if you like decent Viennese opera, which I have to confess i don't so much. Maybe it's an acquired taste, like blue cheese. I like that.
Do you have a good imagination? You have to be willing to overlook the budget, which didn't bother me that much--cheesy synth intro-outro, a modern chainlink fence, electric lights, battery-powered flashlight, in with the 1876-77 phonograph and telephone prototypes that wouldn't have been in private homes yet.
The personalities that the script gave Holmes and some of the other characters were a little off, but I just let it go. I never would have thought of Lee, Macnee (not McNee as in the Hulu synopsis) and Fairchild together in the same picture, but it worked somehow. Fairchild got to be wittier than usual, but Macnee didn't get to be his usual quick-with-the-comeback self. Lee held it all together. I wouldn't want to be on the receiving end of his penetrating, accusing visual appraisal in real life. Humperdinck didn't quite fit in the main plot, and I'm not sure why he was in there except for a bizarre aside.
It was all little confusing, trying to sort out the bad guys, the good guys, and the guys who were just in the way with the various plot red herrings. Interesting reminders about Bosnians versus Serbs, and Austrians versus Germans. History repeats itself.
I had fun.