“I say, are you really?” Anthony’s enthusiasm was all that the most exacting detective could have required. “Mean you’ve solved the whole thing?”

“Well, I wouldn’t go so far as to say that,” Roger said modestly. “But I do think I’m beginning to see daylight. I’ve got a rather stupendous idea, at any rate, and things seem to be fitting into it rather neatly.”

“What is it?”

“Oh, you mustn’t ask me that yet. I shall have to chew it over a lot more before I can make a connected and logical story of it. Besides, the best detectives always hold up their brilliant solutions for the most effective moment (surely you know that), and I refuse to think that an audience of Anthony Walton, two green crabs and a limpet would be in the least effective.”

“Well, hurry up and think it out properly,” said Anthony, ignoring this pleasantry. “You know we all want to see this damned business cleared up once and for all.”

“Then let’s go back and have our tea. And after that, if you’ll leave me to myself for a couple of hours, I’ll see what can be done.”

Inspector Moresby had still not returned to the inn when they got there, as the landlord informed them on Roger’s enquiry. Roger wondered uneasily what exactly he might be up to; feeling as he did that he himself was on the verge of the truth he had no wish that anybody should forestall him in crossing it.

Throughout tea he chattered incessantly about nothing at all, explaining on Anthony’s remonstrance that he wished to clear his brain of all stale notions in order to approach the problem afterward with an entirely fresh mind.

As soon as they had finished he took his pipe down once more to the rocks, and sternly forbade Anthony to come within half-a-mile of him.

More than the stipulated two hours had passed before he climbed once more up to the little path along the face of the cliff and thence to the top of the headland where Anthony, bored beyond tears with his own company but far too eager to risk missing his cousin’s return, was anxiously waiting.