*** The Italian Secretary, Caleb Carr, 2005
Three stars for Holmes buffs, two stars for everyone else. As noted elsewhere, I have a decent collection of extra-canonical Homes stories and I'm always looking to exend it. I noticed this in B&N on the way from the coffee shop to the screenwriting critique group, and grabbed it. Later I realized it was by Caleb Carr of The Alienist.
It's a decent addition to the canon, but there are others I think feel more authentic, such as Meyer or Hardwick or the stories by Doyle's grandson, Adrian Conan Doyle with John Dickson Carr. Hmm, Carr. Wonder if there's a connection. Could be Caleb's father or uncle or something.
While digging around, I also found this website, where a guy has indexed the characters in 298 novels, 896 short stories and 88 kid's stories about Holmes. I guess my collection of 20+ books is meager, after all.