A brief silence ensued, then Longorio shrugged. "Who knows? Let us hope that he suffered no harm on Mexican soil. That would be serious, indeed; yes, very serious, for I have given my word to your government. This—David Law—" he pronounced the name carefully, but with a strange, foreign accent—"he is a reckless person to defy the border regulations. It is a grave matter to invade foreign territory on such a mission." Longorio again bent his brilliant eyes upon Alaire. "I see that you are concerned for his safety. You would not desire him to come to trouble, eh? He has done you favors; he is your friend, as I am. Well"—a mirthless smile exposed his splendid white teeth—"we must think of that. Now I will bid you good night."

"Where are you going?" demanded Miss Jones.

"To the river, and then to Romero. I may be needed, for those men of mine are stupid fellows and there is danger of a misunderstanding. In the dark anything may happen. I should like to meet this David Law; he is a man of my own kind." Turning to "Young Ed," he said: "There is reason for haste, and a horse moves slowly. Would you do me the favor, if you have an automobile—"

"No! I won't!" Ed declared. "I don't want to see the Rio Grande to-night. I won't be involved—"

"But you are already involved. Come! There is no time to waste, and I have something to say to you. You will drive me to the river, and my horse will remain here until I return for him."

There was no mistaking the command in Longorio's tone; the master of Las Palmas rose as if under compulsion. He took his hat, and the two men left the room.

"Oh, my God!" Paloma gasped. "They'll be in time, and so will the Lewis gang."

"Quick! Ed will take his runabout—we'll follow in my car." Alaire fled to make herself ready. A few moments later she looked out from her window and saw the headlights of Ed's runabout flash down the driveway to the road; then she and Paloma rushed to the garage where the touring-car stood.

"They'll never expect us to follow them"—Alaire tried to speak hopefully—"and we'll drive without lights. Maybe we'll get there in time, after all." As the machine rolled out through the gate she elaborated the half-formed plan that had come to her: "The brush is thick along the river; we can leave the car hidden and steal up to the pump-house. When we hear the boat coming maybe we can call out in time to warn your father."

"The moon is rising," Paloma half sobbed. "They'll be sure to see us.
Do you think we're ahead of Tad Lewis?"