[Spoiler Alert - no details, but the general plot features are discussed]
Before there was the "Matrix" or "Aliens" or even "X-Files" and "Fringe", there was Sinister Barrier the 1939 debut novel by Britis SF author Eric Frank Russell, a member of the Science Fiction and Fantasy Hall of Fame.
The author starts with the questions, "If everyone wants peace, then why don't we get it?" and "If there are aliens, why haven't they appeared yet?"
The answer is even more terrifying than Morpheus's answer to Neo in The Matrix. Humans are cattle to an alien race, and have always been. They share the world with us and feed off of our nervous energy, the more intense the better, especially fear and anger.
The enemy is not invisible, but simply exist in a frequency range that unaided human eyes cannot see. And they can read our minds. Anyone who even thinks about the possibility of their existence is doomed as soon as one of the aliens comes close enough to sense his or her thoughts.
But as science progresses, an accidental discovery reveals their secret, even though the discoverers die like flies, one after the other. But the secret spreads, and finally the truth is revealed.
However, truth does not bring freedom. Instead it brings doom. Unable to hide any longer, the aliens, like any rancher faced with rebellious cattle, decides to wipe the human race out in a great feast of terror and agony.
Merely being able to see the aliens is no help, since we, the humans, still cannot touch them. All we can do is run - and die.
The story is told from the viewpoint of a pair of security agents, like Fox and Mulder, who are assigned to investigate the mysterious chain of deaths of prominent scientists.
The book was written in 1939, so the language is reminiscent of a noir detective thriller of the period and may jar some modern readers, but the tone is not heavy or intrusive. Given that it was before World War 2, the writer's future world is incredibly predictive.
Police forensics are emphasised, using such things as 3D cameras and lasers to detect impressions in fibrous surfaces, telephones have video screens and conference speaker capabilities. The most common vehicle is the gyrocycle, a fully covered, two wheel vehicle that can remain upright by itself, something that is actually in development right at this moment and is slowly coming to market. Pistol bullets are "segmentary" similar to experimental frangible bullets of today.
The book is an alien invasion, murder mystery, and horror story all in one and is the grandfather to all the iconic stories mentioned at the beginning.
If you enjoy truly classic science fiction and a rousing thriller, read Sinister Barrier.