"But I hear that you were on Seal Island."

"Quite a mistake, sir. I haven't set foot on Seal Island for more than a twelvemonth, and that was when I went with Farmer Trebarwith."

"It is sometimes awkward for a man to have a double, Tassh," said Sir Silas grimly, "especially in a small place like Polkerwyck. All the same, Tassh, I have a few questions to put to you later on. Go to your room and remain there till I send for you."

"Very good, sir."

Without the faintest trace of emotion the butler withdrew. The baronet waited till the latch of the door clicked and turned to Atherton.

"You are quite sure of what you said about Tassh?"

"Yes, sir; and the rest of us saw him too."

"But there is such a thing as mistaken identity?"

"Well, then, sir, in that case both Peter Varco and Tregaskis saw him. Tregaskis took him off the Island in his boat."

"Strange," commented Sir Silas.