Really good watch, might watch again, and can recommend.
To absolutely fair, I'm not sure if this will appeal to Sherlock Holmes fans, but does expand the "Sherlock-verse", so make up your own mind.
I love Millie Bobby Brown ("Stranger Things"), and this proves she is quite capable of not only leading a movie, but carrying the entire bloody thing.
Despite what feels almost a lack of contribution from everyone else in the movie, this actually turns out quite good. I do wish she didn't do the fourth wall breaks, it really feels like she's either turning to a documentary crew or suddenly... read the rest.