I’ve got more of my story, if anyone’s interested.
The setup: sometime in the (relative) near future, a way to eliminate many diseases from almost all organisms is perfected. Lifespans shoot up, plagues (including STDs) and blights are a thing of the past. Life is good.
Now, most animals’ population is controlled by food supply and diseases. Humans are also controlled by war. Remove famine and plague from the equation, and things look bad.
Fortunately for the human race, some people notice this ahead of time, and send out colony ships to nearby star systems. The early ones are sleep ships, loaded with cryogenically stored people and tools. Soon (after many sleeper ships, before anything too big happens on Earth) FTL is invented. It’s a standard Gate deal: big shiny things in space that can connect two unconnected points. However, it’s useless for getting to places you haven’t already been to and built a gate at.
So, early ships still in the void moving at relativistic speeds (and some ‘young’ colonies), and ships that used a proto-Gate engine that requires little fuel and is a basic sci-fi starship engine as far as intra-solar system flight is concerned (accounting for planetary revolution, of course). Ships with really good proto-Gate drives left later and arrived earlier than most ships.
Now, picture humankind scattered amongst the stars. Due to the difficulty of synching colony start times, very few inter-system Gate connections exist. The colonies that started later have intra-system gates, to facilitate bringing raw material from planet to planet in bulk.
Enter the Mothership.
The Mothership was the last thing to come out of Earth before it got blown to hell. It can warp without Gates, doesn’t use fuel, and is Turing-intelligent. It owes alliegence to humanity as a whole, and showed up at the location of the last-launched colony ship before it did. It helps set up an interplanetary trade network, can zip people or gates to uncharted locations, and refuses, on pain of self-exile, to let anyone examine it in detail.
So, the human federation, based on peaceful trade (The Mothership really doesn’t like interplanetary war) is humming along, when the Horde* attacks. The Horde is a horde of robotic Von Neumann killing machines. They descend on weak planets, kill everyone they can, smash or steal the technological infrastructure, and use it to attack the next planet. There have been many Human-Horde wars in the past, and at the time of the story, all is quiet on the galactic front.
We meet our character, who is on a research station which is attacked by the Horde for no apparent reason. He escapes, making it to a gate with the data that the station collected, and crashes on a nearby planet. He manages to beg, borrow, or steal transport off the planet, only to be met with a Horde offensive.
Meanwhile, Mothership is acting strangely.
I would point out that Gates can’t transmit signals (no galactic Internet), and that Gates require energy to bend space long distances. This means that the Horde can’t go from backwater-gate to Human Central. Neither can the protagonist, however.
Our hero decides that he has something powerful in the data he’s got, and tries to make his way to the seat of Government to present his data/point out that the Horde is following him. He can’t send an e-mail, because it might be intercepted, and because the odds are the Horde would pinpoint him with it. The story will be him trying to get from planet to planet without drawing attention to himself (he connects his presence on the local data nets with the horde assaults pretty quickly).
I’ve got a resolution for my above planet: The hero resorts to major crime, skips town ASAP, and hears that just as Big-Brother world is gearing up for war with the Horde, the last remnants of the dissidents sabotage everything they can. The horde massacres revolutionaries and opressors alike.
I’m still working on the climax, but I have the plot twist down: the Horde is a creation of Mothership. Mothership figured out from the destruction of Earth that people needed an enemy, and provided one. The plot twist will be found when our hero discoveres that the Horde has found several ancient sleeper-ship colonies that have denegerated into barbarism, and is re-civilizing them.
A note on interplanetary war between Horde and human: When a large fleet of horde ships is discovered coming out of a Gate, the humans send an SOS drone to the central government, and does their best to blow up their own gate before more Horde ships Gate in. The concept of self-destructing Gates was abandoned when the Horde caught on to sending small ships at random intervals with the sole intent of destroying Gates. Horde ships are several steps behind human technology: They can steal tech and learn tactics, but not research things themselves.
*I really don’t want to call it this. Please, suggest a better name.
My longest post to date! So, tell me what you think!