In a supernatural war between forces of Light and Darkness, teenage Helana learns from her mother in `night school` that she and her sisters are warriors protecting Earth's timeline, which is being destabilized by powerful level 10 entities who can alter reality itself. After Eileen shoots a gunman to save her friends, the girls face increased danger as the Darkness targets them for their forbidden knowledge, while government agents struggle to protect them and keep their true mission secret from suspicious parents.