I must begin by taking you back to a summer day fifteen years ago, when I was a boy of thirteen and Mark a young man of twenty-five. His whole life was make-believe, and just now he was pretending to be a philanthropist. He sat in our little drawing-room, flicking his gloves against the back of his left hand, and my mother, good soul, thought what a noble young gentleman he was, and Philip and I, hastily washed and crammed into collars, stood in front of him, nudging each other and kicking the backs of our heels and cursing him in our hearts for having interrupted our game. He had decided to adopt one of us, kind Cousin Mark. Heaven knows why he chose me. Philip was eleven; two years longer to wait. Perhaps that was why.