we shall come at two, said Holmes. Sir Henry Baskerville and Dr Mortimer left the house and walked along Baker Street. Sherlock Holmes watched them through the window of his study.
'Quick, Watson, we must follow then,' said Holmes. I put on my hat and follwed Holmes into the street. 'Why are we following them?' I asked in surprise.
'Because, my dear Watson, someone else is also is following them,' said Holmes. 'Look! There is the man. There in that cab!'