Eighteen-year-old Abigail Park is fine. Really. One month after her father's unexpected death, she wants everything to get normal again. So long as she keeps moving, keeps doing her homework, and keeps practicing taekwondo with her litle sister, everything will be fine. When a bizarre event yanks the two sisters across the universe, they'll have to rely on each other to survive, to mourn, and to defy the fate awaiting them at the hands of merciless aliens.