The year is 2037. Humanity is tearing itself apart.
Nations are closing their borders. Millions are being forced from the countries they called home. And while Earth argues over who belongs where, thirty-six people aboard the Horizon are eight months into humanity's first mission to permanently settle Mars.
Then a wormhole opens in the Solar System.
Aliens come through.
They don't invade Earth.
They don't threaten us.
They barely acknowledge us.
Instead, enormous machines spread across the Solar System. Asteroids are harvested. Worlds begin changing. And Mars-the planet humanity spent decades and trillions preparing to reach-is transformed before Horizon can get there.
Water.
Atmosphere.
Weather.
Then something unmistakable:
Someone else is moving in.
On Earth, billionaire Adrian Vale watches humanity's future disappearing one world at a time. Mars. The asteroid belt. Beyond. He built his empire believing mankind's destiny was among the planets-and he has no intention of standing by while an alien civilization quietly plants its flag across the Solar System.
But the aliens still won't answer.
And that silence may be more dangerous than any invasion.
Because Horizon cannot turn around.
Earth cannot agree on what to do.
And the closer humanity gets to forcing a confrontation, the harder one question becomes to ignore:
If these worlds were ours... why weren't we already there?
THEY CAME FOR MARS is a fast-moving first-contact science-fiction thriller about humanity's race to Mars, an alien civilization that refuses to play by our assumptions, and a world so busy fighting over who belongs on Earth that it may have surrendered the stars.
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