The Mystery of the Barranca by Herman Whitaker

One afternoon about a week later Mr. William Thornton was to be seen mixing mortar for the bricks he was laying on the smelter foundation. Rising almost sheer from the edge of the bench behind him, the Barranca wall shut off the western breeze, and from its face the fierce sunblaze was reflected in quivering waves of heat. Coming out from an early lunch he had noted that the thermometer registered ninety in the shade, and he was now ready to swear that with one more degree he himself would be able to supply all the moisture required for the operation.

While working he cast occasional glances toward the house; and when, the mortar being mixed, he began to lay brick he used the trowel with care lest its clink should awaken Seyd. For though the blood loss from a severed artery had left him quite weak, he had obstinately refused to stop work. Today he had even balked at the suggestion of a siesta until Billy had lain down himself. As soon as Seyd fell asleep Billy had slipped out, and when he now paused to listen the concern in his look passed into sudden attention as the clink of a shod hoof rose up from the trail below.