Murray Leinster's "The Invaders" (novella, first contact, free): What could aliens technologically only a few centuries ahead of us want from us?

Coburn accidentally discovered aliens masquerading as humans in remote Greece. He'll convince officialdom of their existance. Whole NATO military gets out after them. But the aliens are behaving in a very peculiar, friendly, manner...

Notes.

1. This is a cold war story, from US side. A lot of descriptions are clearly very biased.

Fact sheet.

First published: Amazing Stories, April-May 1953.
Download full text from Project Gutenberg, Manybooks, Feedbooks.
Rating: B.
Related: Stories of Murray Leinster, from 1950s.