Alan E Nourse's "Infinite Intruder" (novelette, grandfather paradox, free): When a man was his own grandfather!

Decent first half where suspense builds up; crappy second half where we are handed a lot of stuff about the pseudo-Physics & limitations of time travel.

Through the story, we'll see Eurasia destroyed in an "Atomic War" with the US, & a US Dictator beginning attacks on Mars inhabited by peaceful Martians who do have enormous resources.

Story summary.

Some people have been trying kill the little son of Roger Strang, a man building some sort of "electronic Barrier" to protect the US from atomic war with "the Eurasian Combine". And local security people think Roger is mad & don't plan to investigate; in fact, they accuse him to be an impostor ... some kind of a spy planted in their midst!

Suspense will slowly reveal, but only after we're handed far too much crap on time travel technology & rules.

Fact sheet.

First published: Space Science Fiction, July 1953.
Download full text from Project Gutenberg, Manybooks, or Feedbooks.
Rating: B.
Related: Grandfather paradox in fiction; fiction from 1950s.