Holmes and Watson then go to their old apartment in Baker Street, where Holmes' rooms were kept as he had left them thanks to Mycroft's supervision. Moran's motive in killing Adair is a matter of speculation even for Holmes. Nonetheless, his theory is that Adair had caught Moran cheating at cards, and threatened to expose his dishonourable behaviour. Moran therefore got rid of the one man who could rob him of his livelihood, for he earned a living playing cards crookedly, and could ill afford to be barred from all his clubs.