Nardiath Intervention

The propulsion system of a crashed flying saucer is recovered and, after a hundred years of trying, it was finally adapted to military aircraft. Now the testing began, with nine men trying to control it and failing. They all died and their bodies never recovered. Enter Jack Christophson, one of the best test pilots in the world. He returned to Earth with an incredible story of going to Jupiter and back, in what had seemed to him to be about forty minutes. The actual time was a bit more than six hours, and Jack couldn't explain where that time had gone.