But he did not go to the Medina ranch that evening, for the very good reason that he met his man fair in the trail as it looped around the head of the draw where he had heard the automobile running without lights. As on that other evening, Starr had cut straight across the loop, going east instead of west. And where the trail forked on the farther side he met Estan Medina driving a big, lathery bay horse hitched to a shiny, new covered buggy. He seemed in a hurry, but he pulled up nevertheless to have a word with Starr. And Starr, always observant of details, saw that he had three or four packages in the bottom of the buggy, which seemed to bear out Estan's statement that he had been to town, meaning San Bonito.

Starr rolled a cigarette, and smoked it while he gossiped with Estan of politics, pretty girls, and the price of mutton. He had been eyeing the new buggy speculatively, and at last he spoke of it in that admiring tone which warms the heart of the listener.

"Some turnout, Estan," he summed up. "But you ought to be driving an automobile. All your friends are getting them."

Estan lifted his shoulders in true Spanish fashion and smiled. "No, amigo. Me, I can take pleasure yet from horses. And the madre, she's so 'fraid of them automobiles. She cries yet when she knows I ride in one a little bit. Now she's so proud, when I drive the new buggy home! She folds so pretty her best mantilla over her head and rides with me to church, and she bows so polite—to all the señoras from the new buggy! And her face shines with the happiness in her heart. Oh, no, not me for the big automobile!" He smiled and shrugged and threw out his hands. "I like best to see my money walking around with wool on the back! Excuse, señor. I go now to bring the new buggy home and to see the smile of my mother." Then he bethought him of the tradition of his house. "You come and have a soft bed and the comfort of my house," he urged. "It is far to San Bonito, and it is not so far to my house."

Starr explained plausibly his haste, sent a friendly message to the mother and Luis, and rode on thoughtfully. Now and then he turned to glance behind him at the dust cloud rolling rapidly around the head of the draw.

Since Estan had been to town himself that day, Starr reasoned that there would not be much gained by scouting through the arroyos that led near the Medina ranch. Estan would have seen in town the men he wanted to see. He could do so easily enough and without exciting the least suspicion; for San Bonito had plenty of saloons that were popular, and yet unobtrusive, meeting places. No need for the mysterious automobile to make the long journey through the sand to-day, if Estan Medina were the object of the visit, and Starr knew of no other Mexican out that way who would be important enough to have a hand in the mixing of political intrigue.

He rode on, letting Rabbit drop into his poco-poco trail trot. He carried his head bent forward a little, and his eyebrows were pulled into a scowl of concentrated thought. It was all very well to suspect Estan Medina and to keep an eye upon him, but there were others who came nearer to the heart of the plot. He wanted to know who these were, and he believed that if he could once identify the four Mexicans whom Helen May had seen, he would be a long step ahead. He considered the simple expedient of asking her to describe them as closely as she could. But since secrecy was the keynote of his quest, he did not want to rouse her curiosity, and for purely personal reasons he did want to shield her as far as possible from any uneasiness or any entanglement in the affair.

Thinking of Helen May in that light forced him to consider what would be her plight if he and his co-workers failed, if the plan went on to actual fulfillment, and the Mexican element actually did revolt. Babes, they were, those two alone there in Sunlight Basin, with a single-shot "twenty-two" for defense, when every American rancher in three States considered high-power rifles and plenty of ammunition as necessary in his home as flour and bacon!

Starr shivered a little and tried to pull his mind away from Helen May and her helplessness. At any rate, he comforted himself, they had the dog for protection, the dog who had been trained to jump the corral fence at any hour of the night if a stranger, and especially a Mexican came prowling near.

But he and his co-workers must not fail. If intrigue burrowed deep, then they must burrow deeper.