All the stories have a suitable Holmesian atmosphere, the first two of the twelve being somewhat ridiculous, but then they tend to get better with each one. There's a degree of trope-dumping to be expected of a pastiche, and some recycling/redressing of plots, but Doyle Snr. did that himself.
No telling of the Giant Rat of Sumatra case, the most evocative title for me of all the Untold Tales, but otherwise a pretty strong offering. 4🔎
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If you've read and enjoyed the Canon, these are a good addition. (edited) 4mo