Before the prince could reply there occurred a phenomenon that sent all thought of such insubstantialities as the secrets of the Fourth Dimension far in the background. The prince's motor, closely followed by the others of the train, had reached a little eminence from which the island unrolled in fair patterns. Before them the smooth road unwound in varied light. At their left lay a still grove from whose depths was glimpsed a slim needle of a tower, rising, arrow-like, from the green. In the distance lay Med, with shining domes. The water of the lagoon gave brightness here and there among the hills. And as St. George and the prince looked over the prospect they saw, far down the avenue toward Med, a little, moving speck--a speck moving with a rapidity which neither the prince's motor nor any known motor of Yaque had ever before permitted itself. In an instant the six members of the Royal Golden Guard, who upon beautiful, spirited horses rode in advance of the train of the prince, wheeled and thundered back, lifting glittering hands of warning. "Aside! Aside!" shrieked the main Golden Guard, "a motor is without control!" Immediately there was confusion. At a touch the prince's car was drawn to the road's extreme edge, and the Golden Guards rode furiously back along the train, hailing the peaceful, slow-going machines into orderly retreat. They were all sufficiently amenable, for at sight of the alarming and unprecedented onrush of the growing speck that was bearing full down upon them, anxiety sat upon every face. St. George watched. And as the car drew nearer the thought which, at first sight of its speed, had vaguely flashed into being, took definite shape, and his blood leaped to its music. Whose hand would be upon that lever, whose daring would be directing its flight, whose but one in all Yaque--and that Olivia's?