‘There are still some things I don’t understand,’ I said to Holmes. ‘Tell me- who was Stapleton? Why did he want to kill Sir Henry?’
‘It is simple, my dear Watson,’ said Holmes. ‘Remember Sir Charles had two brothers. The youngest brother, Roger, was a bad man. He got into trouble over money and went to South America. He died in Venezuela. He did not marry, so no one knew he had a son.’