Ordinarily, he should have been delirious from the pain of jaw and leg, but the controls of the plane were before him and he saw nothing else. Wings and propeller were better than legs! He was in his element: by the sixth sense of born airmen, he knew and could handle any flying machine, no matter how foreign. In a second, his fingers had fumbled onto the starting button. The choke of the motor and then its full-throated roar were sweet to his ears. The lonely golf course and the night re-echoed with the bellow of twelve pistons thrusting in line; watching, one would not have dreamed that a cripple was at the controls of the plane that now swung around with a blast of power, leveled its nose down the course and raced smoothly over close-clipped grass. Its wheels bumped, spun on the ground and lifted into air. A mile to the dam! Istafiev's words came back to him. It would take Kashtanov twenty minutes at least, for he would go cautiously. But how long had passed--how long? That was the agonizing question. Staring forward through the hurtling prop, the night rushed at him; the dark hills melted away to either side; clear ground swept into view and then a long black thread that was the spillway channel. Behind was the bubbling, leaping flow of the spillway itself, and Gatun Dam. The smooth cement sides were as yet unharmed. "Thank God!" Chris muttered. "Now, where--where?" A stream of light flowed out from the hydro-electric station on the left side of the spillway channel. The opposite bank was bare, running right up to the face of the dam beneath the spillway's seven gates. There the box was to be placed. But from the air, the light was uncertain, deceptive--and a little two-foot-square box was all he had to go by! "I can't see!" Chris said hoarsely. "I can't see!" * * * * * Like a roaring black meteor the plane hurtled over the banks of the spillway, the eyes of its pilot scouring the ground. It zoomed just in time to miss the wall of the dam, banked, doubled like a scared jack-rabbit, dove down again, coming within feet of the spillway channel. Mad, inspired flying! But what good could it do? Then from its cockpit came a yell. "There! There! By heaven, I can make it!" Two or three hundred feet--it was not clear just how far--from the face of the dam, on the bare right bank of the channel, a tiny pin-prick of black was moving slowly along. It seemed to move by itself through the air. And now, as the screaming plane banked again and came rushing closer, the pin-prick grew into a black box that suddenly stopped its advance, held motionless some four feet off the ground. Though the man who held it was not visible, Chris could fancy him staring up at the plane, could fancy the look of consternation on his unseen face.