Inside the domes of Mars Colony One, Lizzy Engram and her fellow cadets work to make the Red Planet habitable. And every Sunday night, the doctors erase their memories. The cycle continues until one day, Lizzy wakes with all of the missing memories inside her head—and not just her own, but the memories of everyone on the colony. Now balancing these thoughts, fears, ideas, and secrets, Lizzy has six days to figure out what the doctors are hiding—or she’ll lose more than her memories.