Still mourning the death of her mother, 16 year old Angela, who's had some behavioral/mental instability issues, tries her best to keep harmony in the house. She takes care of her 6 year old sister Chloe and tries to keep the peace with her difficult, goth 17 year old sister Becca. Becca is furious that their father Jason pulled them out of school and hired grad student Gabby to home school them. When Becca starts exhibiting bizarre behavior, only Angela can see that she is possessed by some strange alien being, and is putting Chloe in grave danger.