“I can not understand it. The fellow is either lying low, or he’s gone out, leaving his lamp to go out, too. But whose is the horse—just excuse me while I tie him up again. It looks like the one he was driving to-day. It is the one. Well, he won’t leave him here all night. Shall we lie low and wait for him to come and unhitch this animal? Or do you prefer to return to the hotel?”

Mr. Grey was slow in answering. Finally he said:

“The man may suspect our intention. You can never tell anything about such fellows as he. He may have caught some unexpected glimpse of me or simply heard that I was in town. If he’s the man I think him, he has reasons for avoiding me which I can very well understand. Let us go back,—not to the hotel, I must see this adventure through tonight,—but far enough for him to think we have given up all idea of routing him out to-night. Perhaps that is all he is waiting for. You can steal back—”

“Excuse me,” said Sweetwater, “but I know a better dodge than that. We’ll circumvent him. We passed a boat-house on our way down here. I’ll just drive you up, procure a boat, and bring you back here by water. I don’t believe that he will expect that, and if he is in the house we shall see him or his light.”

“Meanwhile he can escape by the road.”

“Escape? Do you think he is planning to escape?”

The detective spoke with becoming surprise and Mr. Grey answered without apparent suspicion.

“It is possible if he suspects my presence in the neighborhood.”

“Do you want to stop him?”

“I want to see him.”