Her quiet answer went far to allay his sudden suspicion, but not his anxiety. He spoke of Billy. “It is over a month since he came out to the station for stores, and the agent told me that none of your people had seen him for weeks.”

“But he has with him Angelo”—she gave Caliban his correct name—“and he, as I once told you, was counted Sebastien’s best man in his war against the brigands. Though he may not show it to you, he is not ungrateful for the gift of his life. If food is to be had in the country, Mr. Thornton will not go lacking.”

He spoke more cheerfully. “Then I don’t care; though if the site is flooded we shall be thrown back at least three months with our work.”

“And what is three months?” she added, laughing.

To him it was a great deal. Before paying over the loan Don Luis’s lawyers had taken Seyd’s signatures upon certain instruments which exhibited the General in the new light of a shrewd and conservative business man. Withal, having still plenty of time, he answered quite cheerfully when she turned the conversation with a question concerning his plans. Under the stimulation of her curiosity, which surprised him by its intelligence, he went into details, talking and answering her questions while the horse trudged steadily on into the darkening rain. If the trail had not suddenly faded out, night would have caught them unnoticed.

In that volcanic country, where for long stretches a hoof left no impression, the loss of a trail was a common experience, and, trusting to the instinct of the beast, Seyd gave it the rein. Left to its own devices, however, it gradually swerved from the beating rain and presently turned on to a cattle track which swung away into gum copal trees and scrub oak at an imperceptible angle. Had he been alone Seyd would have soon noticed the absence of the Aztec ruin. As it was, but not until an hour later, Francesca was the first to speak.

“That’s so,” he agreed, when she drew his attention. “We ought to have passed it long ago. The animal evidently picked up a wrong track coming out from the rocks.” After a moment’s reflection he said: “It would be worse than foolish to try to go back. We could never find the trail in this black rain. Better follow on and see where it will bring us.” With a sudden remembrance of what it might mean to her, a young girl brought up in the rigid conventions of the country, he repentantly added: “I’m awfully sorry for you. I ought to be kicked for my carelessness.”

“No, I have traveled this trail much oftener than you,” she quietly protested. “If any one is blamed I should be the one.”

Sitting there in black darkness, lost in those lonely volcanic hills, with the rain dashing in his face and the roar of the wind in his ears, he was prepared to appreciate her quiet answer. “You are a brick!” he exclaimed. “Nevertheless, I feel my guilt.”

“Then you need not.” She gave a little laugh. “Did I not say that I enjoyed being out at night in the rain?”