Mortimer Sturgis, when I first knew him, was a care-free man of thirty-eight, of amiable character and independent means, which he increased from time to time by judicious ventures on the Stock Exchange. Although he had never played golf, his had not been altogether an ill-spent life. He swung a creditable racket at tennis, was always ready to contribute a baritone solo to charity concerts, and gave freely to the poor. He was what you might call a golden-mean man, good-hearted rather than magnetic, with no serious vices and no heroic virtues. For a hobby, he had taken up the collecting of porcelain vases, and he was engaged to Betty Weston, a charming girl of twenty-five, a lifelong friend of mine. I like Mortimer. Everybody liked him. But, at the same time, I was a little surprised that a girl like Betty should have become engaged to him. As I said before, he was not magnetic; and magnetism, I thought, was the chief quality she would have demanded in a man. Betty was one of those ardent, vivid girls, with an intense capacity for hero-worship, and I would have supposed that something more in the nature of a plumed knight or a corsair of the deep would have been her ideal. But, of course, if there is a branch of modern industry where the demand is greater than the supply, it is the manufacture of knights and corsairs; and nowadays a girl, however flaming her aspirations, has to take the best she can get. I must admit that Betty seemed perfectly content with Mortimer. Such, then, was the state of affairs when Eddie Denton arrived, and the trouble began. I was escorting Betty home one evening after a tea-party at which we had been fellow-guests, when, walking down the road, we happened to espy Mortimer. He broke into a run when he saw us, and galloped up, waving a piece of paper in his hand. He was plainly excited, a thing which was unusual in this well-balanced man. His broad, good-humoured face was working violently. "Good news!" he cried. "Good news! Dear old Eddie's back!" "Oh, how nice for you, dear!" said Betty. "Eddie Denton is Mortimer's best friend," she explained to me. "He has told me so much about him. I have been looking forward to his coming home. Mortie thinks the world of him." "So will you, when you know him," cried Mortimer. "Dear old Eddie! He's a wonder! The best fellow on earth! We were at school and the 'Varsity together. There's nobody like Eddie! He landed yesterday. Just home from Central Africa. He's an explorer, you know," he said to me. "Spends all his time in places where it's death for a white man to go."