In 2019, teens Mia, Antoine, and Midori are selected by lottery to join experienced astronauts on a NASA mission to the once top-secret moon base, DARLAH 2, while in a Florida nursing home, a former astronaut struggles to warn someone of the terrible danger there.
In 1969, as her own family is falling apart, ten-year-old Mamie finds comfort in conducting a one-sided correspondence with the least famous astronaut heading toward the moon on Apollo 11.