Goodreads meta-data is 134 pages rated 4.19 by 109 litizens.
Genre: Holmesiana.
Verdict: Meh.
Much to’ing and fro’ing as Holmes and his daughter Lucy rescue her mother Zoe from the Black Hand with some carbolic soap. Just kidding. It is all rather a lot for barely more than a hundred pages. It ends with a cliff hanger for the next volume in the series, but I fell off.
If I am reading the information aright, this is book number 23 in this partnership on Holmes.
While I am impressed by that productivity, I have to say that it shows. Tired and trite. Maybe my Holmes addiction is in remission.