The Professor read this letter through twice. His final conclusion was that this man Ludgrove had in some way discovered that the dead men had all been members of the Morlandson jury. After all, he knew from the Black Sailor’s words that Ludgrove had made inconvenient enquiries, and it was possible that he had somehow stumbled upon the truth. Anyway, there could be no harm in going to see him and hearing what he had to say. Besides, he had never conveyed to him the Black Sailor’s warning. Hanslet might have, but the Professor, who had penetrated the ill-concealed scepticism of the Inspector, considered this unlikely. In any case, by comparing notes with this man, who had been living in Praed Street throughout the period of the murders, he might derive a hint which would lead him to his goal.