The first thought of the latter was to rush across the bridge, and make towards his steed. Had he done so, he would have had time enough to escape; but the desire to warn her, so that she might hasten to the house, impelled him to turn back through the grove. She had already reached the open parterre, and was crossing it, when the barking of the dog caused her to stop, and the moment after Carlos came up. But he had not addressed a word to her before the trampling of horses sounded outside the adobe walls of the garden--horsemen galloped down on both sides, while the confused striking of hoofs showed that some were halting outside, while others deployed around the enclosure. The rattling of the timbers of the large bridge was heard almost at the same instant; then the dog breaking into a fierce attack; and then, through the stems of the trees, the dark forms of horsemen became visible upon the opposite bank of the stream. The garden was surrounded! CHAPTER FORTY SEVEN. Long after the lovers had entered the arbour the mestiza had remained in her squatting attitude, listening to the conversation, of which not a word escaped her. It was not, however, her interest in that which bound her to the spot, but her fear of being discovered should she attempt to leave it. She had reason while it was still moonlight, for the open ground she must pass over was distinctly visible from the arbour. It was only after the moon went down that she saw the prospect of retiring unseen; and, choosing a moment when the lovers had their faces turned from her, she crawled a few yards back, rose to her feet, and ran nimbly off in the darkness. Strange to say, the rustling heard by the senorita was not made by the girl at the moment of her leaving the arbour. It was caused by a twig which she had bent behind a branch, the better to conceal herself, and this releasing itself had sprung back to its place. That was why no object was visible to the lovers, although coming hastily out of the arbour. The spy at that instant was beyond the reach of sight as well as hearing. She had got through the avenue before the twig moved. She did not stop for a moment. She did not return to her apartment, but crossing the patio hastily entered the zaguan. This she traversed with stealthy steps, as if afraid to awake the portero. On reaching the gate she drew from her pocket a key. It was not the key of the main lock, but of the lesser one, belonging to the postern door which opened through the great gate. This key she had secured at an earlier hour of the evening, for the very use she was now about to make of it.