Aboard the colony ship, Mercury, 19-year-old Lucy yearns to know more about her deceased father, much to the ire of her mother, the captain. When a mysterious meteor strands Lucy twenty years in the past, she finds herself face-to-face with her teenage mother and realizes they may have more in common than she originally thought. As rifts in space threaten to destroy the Mercury, Lucy looks for a way to save the ship and, with any luck, get back to her own time.