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Ryland Grace wakes aboard a spacecraft millions of miles from Earth with no memory of his identity or mission and two dead crewmates beside him. As his memories return, he realizes he is the sole survivor of a last-chance effort to prevent an extinction-level disaster on Earth. He must reconstruct the mission and solve a scientific mystery with limited time and no nearby human help. An unexpected encounter changes both the problem he faces and the possibility that he may not have to solve it alone.
