The ship that brought them hope... now wants them dead. Adam is the first-and only-human born on Mars. He survived the massacre that killed most of his colony. Now he just wants to keep the others alive.
But Earth has sent new arrivals: a documentary crew, four genius teens, and a mission wrapped in lies. They don't believe what happened here. They were told there'd been an incident. They think the survivors are just traumatized kids.
Until it starts again.
Forced to abandon the Martian surface, the survivors take refuge aboard the orbiting starship Horizon. But the nightmare came with them. Something that doesn't just kill.
It learns. It evolves.
As the infection spreads and the ship turns against them, Adam must lead a fractured crew through a living maze of metal and memory-before there's no one left to save.