More Things in Heaven is a science fiction novel written by John Brunner

John Brunner (novelist)

John Kilian Houston Brunner was a prolific British author of science fiction novels and stories. His 1968 novel Stand on Zanzibar, about an overpopulated world, won the 1968 Hugo Award for best science fiction novel. It also won the BSFA award the same year...

 and based in part on an earlier work, The Astronauts Must Not Land copyrighted in 1963 by Ace Books

Ace Books

Ace Books is the oldest active specialty publisher of science fiction and fantasy books. The company was founded in New York City in 1952 by Aaron A. Wyn, and began as a genre publisher of mysteries and westerns...

, revised version published in 1973 by Dell Books. The title is taken from Shakespeare's Hamlet

Hamlet

The Tragical History of Hamlet, Prince of Denmark, or more simply Hamlet, is a tragedy by William Shakespeare, believed to have been written between 1599 and 1601...

Act 1. Scene V

Plot

A matter transmission machine seems to work properly when it sends things and people out. But when it brings them back, the astronauts have been changed unexpectedly. The machines might not be working properly. Or maybe they are working too well.