The title symbolize us that the place has everywhere fear as scowrers attack and then murders. There is no law and order, rights and equality and everything is going in the favour of scowrers.
Fred Porlock is a petty criminal, working for Professor Moriarty, who occasionally sells information to Sherlock Holmes. The detective likens him to a remora, of no real significance himself, but dancing constant attendance on the great 'shark', James Moriarty.