"Do you remember when Captain Whiteclett came to arrest you, your bed-room door was open just for a minute?"

I did remember now and recalled her face outside and its very expression vividly.

"I heard him call you 'Roger' and saw that you knew each other well, and then of course I knew we had been utterly wrong in thinking you a—"

She paused and I finished the sentence for her.

"A spy."

"Well, are you honestly surprised? You did do some most extraordinary things, Mr. Merton! I only began to get the least idea of what you were about some time afterwards."

"And what idea did you get then? And how did you get it?"

"It was when we began to hear of the bad name our island was getting. Then I guessed you must have been trying to investigate and catch the traitor—and I had gone and interfered—and even locked you up!"

"It was you, then?"

"Well, father, of course, approved, but I locked the door. And after I had found out the truth, I could have murdered myself! But why did you puzzle us so?"