"It could have been a black hole--one of those terrifying rips in space that defy all laws. That it was artificial in origin did not make it any less deadly. Worst of all, that strange extra-galactic torus was drifting into an intersect with earth in its orbit. the result would be devastation beyond concept. Cap Kennedy and his three companions were considered expendable in such a cause. And Cap himself volunteered to dare the impossible--to turn that cosmic hole aside. What he fell into was an adventure utterly different than anything he had expected."--Back cover.