the cliff.

"What on earth were they doing?" asked Carnes in a whisper.

"That was Professor Williams of Yale. They were depriving him of his memory. There will be another amnesia case in the papers to-morrow. I haven't time to explain their methods now: we've got to act. You have a flash-light?"

"Yes, and my gun. Shall we break in? There are only three of them, and I think we could handle the lot."

"Yes, but the others may return at any time and we want to bag the whole lot. They've done their damage for to-night. You heard my orders to Lieutenant Maynard, didn't you?"

"Yes."

"He should be somewhere in these hills to the south with assistance of some sort. The signal to them is three long flashes followed in turn by three short ones and three more long. Go and find them and bring them here. When you get close give me the same light signal and don't try to break in unless I am with you. I am going to reconnoitre a little more and make sure that there is no back entrance through which they can escape. Good luck. Carnes: hurry all you can. There is no time to be lost."