He watched, while, bent over the back of the front seat, she extracted two squat weapons from the chauffeur's pockets. "Quite an arsenal," said Bell as he pocketed them. He turned pleasantly to Ribiera. "Now, Ribiera, you understand just what I want. That big amphibian plane of yours is fairly fast, and once when I was merely your guest you assured me that it was always kept fueled and even provisioned for a long flight. When we reach the flying field I want it rolled out and warmed up, over at the other end of the field from the flying line. We'll go over to it in the car. "And I've thought of something. It worried me, before, because sometimes if a man's shot he merely relaxes all over. So while we're at the flying field I'm going to be holding back the triggers of these guns with my thumbs. I don't have to pull the trigger at all--just let go and they'll go off. It isn't so fine an adjustment as I had just now, but it's safer for you as long as you behave. And you might urge your chauffeur to be cautious. I do hope, Ribiera, that you won't look as if you were frightened. If there's any hitch, and delay for letting some fuel out of the tanks or messing up the motors, I'll be very sorry for you." * * * * * The car swooped out into bright sunshine. The flying field lay below, already in the shadow of the banking clouds above. Hangars lay stretched out across the level space. Through the gates. Ribiera licked his lips. Bell jammed the revolver muzzles closer against his sides. The chauffeur halted the car. Paula spoke softly to him. He stiffened. Bell found it possible to smile faintly. Ribiera gave orders. There was a moment's pause--the revolver muzzles went deeper into his side--and he snarled a repetition. The official cringed and moved swiftly. "You have chosen your slaves well, Ribiera," said Bell coolly. "They seem to occupy all strategic positions. We'll ride across." The gears clashed. The car swerved forward and went deliberately across the wide clear space that was the flying field. It halted near the farther side. In minutes the door of a hangar swung wide. There was the sputtering of a not-yet-warmed-up motor. The big plane came slowly out, its motors coughing now and then. It swung clumsily across the field, turned in a wide circle, and stopped some forty or fifty feet from the car. "Send the mechanic back, on foot," said Bell softly. Again Ribiera found it expedient to snarl. And Bell added, gently, while the throttled-down motors of the big amphibian boomed on: "Now get out of the car." Tiny figures began to gaze curiously at them from the row of hangars. The mechanic, starting back on foot, the four people getting out of the car, the big plane waiting.... * * * * * With his revolver ready and aimed at Ribiera's bulk, Bell reached in the front of the car and turned off the switch. The motor died abruptly. He put the key in his pocket.