he details of the exchange were simple. Hanley, with only one mechanic, would hover at the zero-height, his Wasp lighted so that we could see it plainly. The wind drift, according to forecast, would be southerly. At 11 P.M. Hanley would release from his Wasp a small helium-gas baloon-car—a ten-foot basket with the supporting gas bag above it, weighted so that it would slowly descend into the depths, with a southern drift.
Our flyer, invisible and soundless, would pick up the baloon-car at some point in its descent. The gold would be there, in a black casket. De Boer would take the gold, deposit Jetta and me in the car, and release it again. And when the balloon finally settled to the rocks beneath, Hanley could pick it up. No men would be hidden by Hanley in that basket. De Boer had stipulated that when casting loose the balloon, its car must be swept by Hanley with a visible electronic ray. No hidden men could withstand that blast!
Such was the arrangement with Hanley. I was convinced that he intended to carry it out to the letter. He would have his own invisible X-flyer in the neighborhood, no doubt. But it would not interfere with the safe transfer of Jetta and me.
That De Boer would carry out his part, Hanley could only trust. He had said so this afternoon bluntly. And De Boer had laughed and interposed his voice in our circuit.
"Government money against these two lives, Hanley! Of course you have to trust me!"
t was a flight, for us, of something less than four hours to the meeting place. Hans was piloting, seated alone in the little cubby upon the forward wing-base, directly over the control room. De Boer, with Jetta at his side, worked over his course and watched his instrument banks. I was, at the start of the flight, lashed in a chair of the control room, my ankles and wrists tied and Gutierrez guarding me.
Jetta did not seem to notice me. She did not look at me, nor I at her. She pretended interest only in the success of the transfer; in her father's treasure on board, the coming ransom money, and then a flight to Cape Town, dividing the treasure only with Hans and Gutierrez; and in her marriage with De Boer. She said she wanted me returned to Hanley alive; craven coward that I was, still I did not deserve death. De Boer had agreed. But I knew that at last, as they tumbled me into the basket, someone would slip a knife into me!
I had, as we came on board, just the chance for a few whispered sentences with Jetta. But they were enough! We both knew what we had to do. Desperate expedient, indeed! It seemed more desperate now as the time approached than it had when I planned it.