“You are aware of the steps which I took to bring you here. Had you refused to accompany me this evening, I should have shot you outright in your own study. But I knew that you would not refuse. The solution of the mystery had become a point of honour with you, and, besides, you had a message for me which I was sure that you would be glad of the opportunity to deliver. Surely you would not have hesitated to give the innocent Mr. Ludgrove the Black Sailor’s message, Dr. Priestley?”

The Professor forced a smile. “I had intended to do so, but⁠—he died, to use your own expression, before I had the opportunity.”