It began when a pedestrian got hit by a cab in New York City. No doubt
it was the only motor mishap in the history of creation that reached out
among the stars--for far out in space a signal was registered:
_Something has gone wrong...._
And something had gone wrong, for the doctors discovered their accident
patient had _two_ hearts. It was the beginning of the discovery that the
Earth had been invaded by 10 such creatures from Outer Space.
Every effort was made to learn their purpose. An orbital flight was
launched to spot alien bodies--only to be destroyed in space. One of the
alien men was captured--but no threat of pain or death could unlock the
secret in his brain.
Something had gone wrong. And somehow, some way had to be found to make
it right--before the threat of danger overwhelmed all mankind.