Vaseleos Garson

In case you need another clue to the twist ending, think about this aphorism: One man's trash is another man's treasure...

“The starways' Lone Watcher had expected some odd developments in his singular, nerve-fraught job on the asteroid. But nothing like the weird twenty-one-day liquid test devised by the invading Steel-Blues.”

The story was written in 1952 by Vaseleos Garson (a pseudonym of William J. Garson) and is typical of the science fiction written for the teenagers of that era. It contains commonly used elements such as robots, ray-guns, space travel and aliens.