round and shouted: "But who, Mr. Rolston, is the madman, genius or superman who has imagined this and actually carried it out in sober twentieth-century England?"

"That's the greatest secret of all," he said, looking round the room as if frightened.

Then he slid from his chair and was at my side in a moment.

"It's a Mr. Gideon Mendoza Morse from Brazil," he whispered.