I wouldn't :
- It's a novel where I prefer short stories.
- It sounds like a thriller
- "[...] a case which tests Watson's friendship and the fragility and gifts of Sherlock Holmes' own artistic nature to the limits" does not sound like my cup of tea...
As to whether you should, it's a matter of whether you like the blurb and the excerpt. Without surprise opinions vary wildly on its merits and should be a reminder that anything one values dearly is someone else's trash.