So, I certainly didn't expect this book to start like this. With Sherlock doped up on cocaine - because he was bored. Without a puzzle to keep him ticking over he's lost. Thankfully the boredom didn't last long (long enough though for Watson to lecture him on the dangers of such a drug - very forward thinking for the time).
The arrival of a young lady brings the puzzle that Sherlock craves. And promptly causes Watson to fall in love. A tale of missing treasure, mysterious deaths and cannibals ensues. We also have Sherlock in his first disguise.
Set a few years after [b:A Study in Scarlet|102868|A Study in Scarlet (Sherlock Holmes, #1)|Arthur Conan Doyle|http://d.gr-assets.com/books/1348362236s/102868.jpg|1997473], Dr Watson has published his account of that case, so Sherlock's name is beginning to be recognised, but he still doesn't want the credit, he does it for the love the game.
There were some genuinely unsettling moments. The man that appeared at the window for instance, or the horrific state of poor Mr Sholto, whose murder in a locked room spiced things up.
Watson is the one let down of the story - simpering love-sick fool. Not that I don't believe in love at first sight - but the man proposed after spending less than a day with Mary.