is a science fiction novel
by author Clifford D. Simak
. It was published in 1950
by Gnome Press
in an edition of 6,000 copies, of which 1,000 were bound in paperback for an armed forces edition. The novel was originally serialized in the magazine Astounding
The novel concerns a group of earthmen and a girl who are awakened from suspended animation by aliens with whom they join to prevent the collision of one universe with another.
- Chalker, Jack L.; Mark Owings The Science-Fantasy Publishers: A Bibliographic History, 1923-1998. Westminster, MD and Baltimore: Mirage Press, Ltd..
- Tuck, Donald H. The Encyclopedia of Science Fiction and Fantasy. Chicago: Advent. ISBN 0-911682-22-8.