"Come to remind me of my promise?" laughed Jack, jumping up. But as she drifted slowly in, we saw that, whatever her errand might be, for her it was no laughing matter. "I have to confess a thing to you both," she said. "I have been in the cave. Even before you went away, I made up my mind I would go in. I did not sleep too much. I got up when it was light. I put on a bad dress. I slid down the bank like when I was a little one. I creeped into the cave, with a candle, the way I used to do. It is not distant to the end, where one can squeeze. I looked all over, everywhere, as always when I was small. I remembered a hole far at the back--not a big hole--where I used to put pretty pebbles and play I was Captain Kidd with my pockets full of diamonds. The hole was there, but stuffed up with stones. I pulled them all out. And behind I saw a box--a queer old oak box. But oh, Molly, I have seen that box before, it was only a few days ago!" "Not _possible_!" I cried, anxious to defend poor Peter and his quixotic plot. "You would say not. Yet it is so. I saw the box--or its twin box--at that dear old Robinson house which is made into a curiosity shop at Bennington." "You must have been dreaming," said Jack, backing me up. "No. I saw it. But Mr. Storm did not know I saw it, because he did think I was not in the room where it was. He thought I was always with Mr. Caspian. And so I was, except for a minute. I went to look for you, in a back room. You were not there. You must have gone upstairs----" "I did, to see a table Miss Robinson spoke of," I admitted. "Only Mr. Storm was in the back room. He had in his hand the box, with a large date carved in the wood. If he bought it I am not sure, for I went away quickly when I saw he was alone. And after, there was nothing in his hand. But maybe when he wanted an old box with a date of 1669--yes, that _particular_ date of _all_ others!--he remembered, and went back to Bennington--or sent." "Good gracious, but why a box of that 'particular' date?" I wanted to know. Which was stupid of me. I ought to have recalled at once the fact that Captain Kidd was supposed to be burying treasure in 1669.