"Never mind," said Hewitt. "It was not stupidity, Mr. Potswood--nothing but your openness of character. You were not trained to the cunning that we must use in my profession. And there will be more than Myatt to take--he was not alone! It is plain that Mason was found to be wavering in whatever horrible allegiance he had bound himself, and he was watched. No, Myatt was not alone!" "No, I fear not," replied the clergyman. "I fear not: there is horrible mystery still. The watching and besetting that terrified him so much; the fact that he seems to have yielded up his life without a struggle--and that with help so near; and the connection--what could it have been?--between Mason and the other victim--Denson. That is a deep mystery indeed! And that horrible sign! Mr. Hewitt, you have done much--but not all!" "No," replied Martin Hewitt, "not nearly all. It is even doubtful whether or not it will be my lot to come across the thing again; but it will be in the hands of the police. And, after all, we have achieved something. For we know that if Myatt can be captured we shall be at the heart of the mystery." THE CASE OF THE LEVER KEY I In some of the cases which we now know to have been connected with the Red Triangle, there was nothing, in the first place, to show any such association. In some of these cases the connection has become apparent only since the final clearing up of the whole mystery, and with these cases we have no present concern; but in others it revealed itself during the investigation of the case. It was to this second category that the next case belonged--the next at all connectible, that is, after that of the mysterious death of Mr. Jacob Mason and the flight of Everard Myatt.