This article from 2011 actually tells the full story: http://www.smithsonianmag.com/history/mrs-sherlock-holmes-ta...

I must say, the practice of publishing a single chapter or section from a book as a way to promote it can be really effective, especially if the book is well-written and chapter/section leaves with a cliffhanger. I'm totally tempted to buy this book now.

dittos

Would like to read it but the subscribe dialog doesn't appear to respond to the close button on my iPad. Annoying.