The cement walls themselves were so thick that they seemed impregnable even to cannon. The roof was of slates. And, as has been pointed out already, all the outer first-floor windows, and all those reached from the porch roof, were barred.

Frances knew that her father had been seriously troubled to-night by the appearance of the strange and unseen tramp in the yard, and the fact that the arrival of that same individual had not been reported from the men’s quarters.

Captain Rugley telephoned and learned from his foreman, Silent Sam Harding, that nobody had come to the bunk-house that night asking for lodging and food.

Frances was about to seek her bed. She yawned, curled her bare toes up closer in the robe, and shivered luxuriously as the night air breathed in upon her. In another moment she would pop in between the blankets and cuddle down—

Something snapped! It was outside, not in!

Frances was wide awake on the instant. Her eyelids that had been so drowsy were propped apart–not by fear, but by excitement.

She had lived a life which had sharpened her physical perceptions to a fine point. She had no trouble in locating the sound that had so startled her. Somebody was climbing the vine at the corner of the veranda roof, not twenty feet from her window. She crouched back, well sheltered in the shadow, but able to see anything that appeared silhouetted between her window and the dark curtain of the night.

There was no light in the room behind her; indeed every lamp in the ranch-house had been extinguished some time before. It was evident that this marauder–whoever he was–had waited for the quietude of sleep to fall upon the place.

Back in the room at the head of Frances’ bed hung her belt with the holster pistol she wore when riding about the ranges. In these days it was considered perfectly safe for a girl to ride alone, save that coyotes sometimes came within range, or such a savage creature as had been the introduction of Pratt Sanderson and herself so recently. It was the duty of everybody on the ranges to shoot and kill these “varmints,” if they could.

Frances did not even think of this weapon now. She did not fear the unknown; only that the mystery of the night, and of his secret pursuit, surrounded him. Who could he be? What was he after? Should she run to awaken her father, or wait to observe his appearance above the edge of the veranda roof?