Book excerpt: Some things belong together, the one with the other, natural pairs. Sherlock Holmes and John Watson. Holmes and Watson. Sherlock and John. Whether it's in an empty house during the Blitz, a West London strip club in the 70s, or deep in the heart of a Hong Kong computer lab, the meeting of these two legendary men is inevitable. Spanning one hundred and twenty-eight years, here are the stories of that destiny. Of how a detective meets a doctor, of how they change each other in heart and mind. Of how they fall in love.