‘I know I saw those strange footprints of a huge dog. But …’ He looked at his watch. ‘…I am meeting Sir Henry Baskerville at Waterloo station in an hour Sir Henry is Sir Charles’ nephew. He has come from Canada. Sir Charles has no children, so Sir Henry is now the owner of Baskerville Hall. And now I have a problem.’ ‘What is you problem?’ asked Holmes. ‘I believe that Sir Henry is in danger, ‘said Dr Mortimer. ‘Is it safe to take him to Baskerville Hall?’ ‘I must think, ‘said Sherlock Holmes. ‘Stay in London tonight. Come and see me again tomorrow morning. Please bring Sir Henry with you.’ ‘I shall do so, ‘said Dr Mortimer. He stood up. ‘Now I must go to meet Sir Henry at Waterloo station. Good day.’ When Dr Mortimer had left, Holmes said to me, ‘We have a problem here, Watson. There are three questions. What the crime? Who did it? How was it done?’