"You mean that——"

"That he said if his secret was revealed to the world it would cause a general sensation—that it would do great harm to the world. The secret concerns the mysterious death of Prince H——!"

"But who, then, is 'Meadows'? What has he to do with secrets of such great importance?"

"That I cannot say, but I believe your father may know. Note this, though: your father denies the fact that he confided his secret to 'Doctor Meadows.' We have discovered that Meadows not only holds his secret, but has been bound by your father not to reveal it. If your father denies this, and is, nevertheless, really connected in some way with the 'doctor,' but will not confess to the fact, is it not possible that he, in his turn, knows something about Meadows' secret? I grant you that it does not follow that such is the case, but it is a distinct probability, to my mind."

Laurence could not reply. The argument was a fair one, but Lena's former hypothesis concerning Horncastle's connection with the attacks on the Squire's life had seemed so ingenious and probable a one and yet had been proved to be wrong in every particular.

"At any rate," he remarked, after a pause, "you will agree that we have reached the beginning of the end of this mystery?"

"Certainly; but we have yet much to learn. I doubt not but that the secret of 'Doctor Meadows' will prove less easy to solve than that of your father. I agree with Meadows that much of the mystery we have almost solved should have been explained long ago. The discovery that the Squire had been an Indian officer, coupled with the fact of the unknown assailant's agility, etcetera, should have suggested to us the possibility of the creature being a Thug. The Squire's story has revealed one thing—the reason why he fainted at my mention of the woman in coloured skirts. He thought the avenger had come in the person of Lilla herself (whom he believed to be dead), when what I had seen was this Indian, whose clothing must certainly be somewhat similar to that we associate with a female. Now we know, too, that the 'robbery' of the gardener's coat was effected in order that the assassin might be less recognisable. One thing, though, strikes me as strange. How did this creature learn to ride a bicycle?"

"You mustn't forget that India, like all other countries, is advancing with the times. No doubt the Thugs encourage such a form of athletics among their children. Why he did not return the bicycle to the shed, though, seems difficult to understand; and what is another mystery to me is why he used a pistol on the first occasion, when that weapon is little known among the Thugs."

"Perhaps, finding it so difficult to get into the house and murder your father, he cast caution and his usual weapon to the winds, and essayed the attack on the moor. By chance he discovered the secret passages and room when lurking in that splendid hiding-place, the barn. Then, having lost his pistol, he entered the Squire's room by means of the secret door in the wall, and would have murdered the old man had it not been for the bat."

"But how do you know that the unexplored secret passage does lead to the Squire's room, as Meadows suggested that it might?"