From the boy who falls in love with her every week, to the girl who wants to ruin her life, to the cadets who have disappeared since landing--Lizzy has all of their memories floating inside her mind. Welcome to Mars Colony One. Inside the gleaming domes, cadets work to make the Red Planet habitable. And every Sunday night, the doctors erase their memories. Week by week the procedure is carried out, and no one suspects a thing. Until the morning Lizzy wakes up with all of the missing memories. And not just her own, but the memories of every cadet on the planet. Now balancing the desires, fears, ideas, and secrets of the entire colony, Lizzy has six days to figure out what the doctors are hiding--and how to stop them--or she'll lose more than her memories.