As I cautiously felt my way down the avenue--it was still black dark under the dark trees--and later up the tunnel of the side road which I hit upon by an instinct that made me feel for it at the precise moment when I reached the point of its junction with the avenue--I returned with a sense of satisfaction to the memory of the last four hours. I was conscious of some kind of plan in the way the comedy of Brenda's disappearance had been put before us. I realised that, as an art form, the plan was essentially undramatic, but the thought of it gave me, nevertheless, a distinct feeling of pleasure. I saw the experience as a prelude to this lonely adventure of mine--a prelude full of movement and contrast; but I had no premonition of any equally diverting sequel. The daylight was coming, and I believed, a trifle regretfully, that that great solvent of all mysteries would display these emotions of the night as the phantasmagoria of our imagination. Before I had reached the end of the tunnel through the wood and had come out into the open whence I could, now, see the loom of Jervaise Clump swelling up before me in the deep, gray gloom of early dawn, I had decided that my suggestion had been prompted by an intuition of truth. Brenda had fallen under the spell of the moon, and gone for a long drive in the motor. She had taken Banks with her, obviously; but that action need not be presumed to have any romantic significance. And the Jervaises had accepted that solution. They had been more convinced of its truth than I had imagined. They would never have gone to bed, tired as they were, if they had not been satisfied that Brenda had committed no other indiscretion than that of indulging herself in the freak of a moonlight drive. It had, certainly, been unduly prolonged; but, as old Jervaise had said, there might be half a dozen reasons to account for that. As I turned off the road and breasted the lower slopes of the hill, I was constructing the details of the Jervaises' explanatory visit to the Atkinsons. I had reached the point of making Mrs. Jervaise repeat the statement she had made in the Hall that "dear Brenda was so impossibly headstrong," when I heard the sweet, true notes of some one ahead of me, whistling, almost miraculously, in tune. It isn't one man in a million who can whistle absolutely true. V DAYBREAK He was whistling Schubert's setting of "Who is Sylvia?" and as I climbed slowly and as silently as I could towards him, I fitted the music to the words of the second verse:-- Is she kind as she is fair? For beauty lives with kindness. Only a man in love, I thought, could be whistling that air with such attention and accuracy. He hit that unusual interval--is it an augmented seventh?--with a delicacy that was quite thrilling.