It was all about to start again. Richard Blade was feeling tense, not frightened-he had been beyond that for many years. In twenty years as a secret agent and then several more years of travels into Dimension X; he had seen and done nearly everything a man could do. There was nothing left in this world and little in any other that could actually frighten him. But a trip into Dimension X was a trip into the unknown, and Blade was always keyed up to an extra pitch of alertness when facing the unknown. He had to be. Otherwise he would have been dead a good many times, both on earth and in the «somewhere else» of Dimension X.

That «somewhere else» was still a mystery, even after the years of time and the millions of pounds that had gone into Project Dimension X. Its existence had been discovered the day Blade's brain was linked to Lord Leighton's computer. That computer had been almost a moron, compared to the brilliant scientist's latest creation. But it had served to fling Blade-somewhere. And after Blade's long ordeal of survival, in the «somewhere else,» the computer had also served to bring him back.

The discovery of Dimension X completely eclipsed Leighton's original project of linking a human and a computer intelligence. Being able to penetrate other dimensions and bring back their knowledge and perhaps resources to England was obviously an enormous breakthrough. So what had started out as an eccentric genius's private fancy suddenly became a Frankenstein's monster. Everybody seemed to want to get in on the act. Eventually Project Dimension X settled down to focus on four key people.

There was Blade, the only living man able to travel into Dimension X and return alive and sane, one of the most perfect physical and mental specimens alive. He only hoped that he could stay that way under the strain of successive trips into Dimension X. The one now only a few minutes away would be his sixteenth.