After billions of years the earth has been destroyed in a horrible explosion and humans are forced to live on planet Mars inside a gigantic spaceship. Rebellious thirteen year old Rebecca hates living in space. She misses earth more than anything. But one day she becomes friends with fourteen year old Maddie who is six months pregnant. Maddie tells Rebecca that there's this medicine down in the secret lab that can get women pregnant just by drinking the medicine. Intrigued by this, little Rebecca tries the medicine and becomes pregnant herself. Maddie and her decide to make a club, a pregnancy club.