“You mean the natural phenomenon idea?”

“Precisely,” said he. “I don’t think that it will be able to exist very long in the light of physical knowledge—not that that is a very powerful light, but it should be strong enough for our purpose. As soon as I have convinced myself that our enemy is a mere human being I shall take such steps as I may think necessary at the time. Then, of course, I shall acquaint you with the steps that I have taken, and we shall work together and round up our man, and, figuratively speaking, make him swallow his hideous green ray.”

“What sort of steps do you mean?” I asked.

“Well, that all depends,” my friend answered, “on what sort of man we have to deal with. But it will certainly include providing ourselves with the necessary means of self-defence, and may run to calling in the assistance of the authorities.”

“I’m not sure that the presence of the police in a quiet spot like this might not have a disastrous effect on our plans,” I pointed out.

“I shouldn’t worry about the police,” he laughed. “I should make for the naval chaps. I’m rather pally with them just now; I’m booked up to do some work of various descriptions for the period of the war, and I think if I can give them the promise of a little fun and excitement they would be willing to help.”

“Which indeed they could,” I agreed readily. “Any attempt our enemy might make to get away from us would probably mean a bolt for the open sea, and a few dozen dreadnoughts would be cheerful companionship.”

Garnesk laughed, and we strolled up to the house, putting the finishing touches to our toilet as we went. Shortly after breakfast we made ready for our trip to Mallaig. Myra was very anxious to come with us until I explained that we should have to wait there till we had met Dennis and seen the specialist off. She was naturally sensitive about appearing in public with the shade on, poor child, so she readily gave up the idea.

“I’m very sorry you’re going, Mr. Garnesk,” said Myra, as she shook hands.