At the funeral, a mysterious figure appears: Charlie, Richard's younger brother whom India never knew existed. Charlie announces he is staying indefinitely to support the family. While he quickly charms the emotionally fragile Evelyn, India remains deeply suspicious of his sudden presence and charming facade.

As Charlie settles in, people close to the family begin to disappear, starting with the head housekeeper, Mrs. McGarrick, and later India's great-aunt Gwendolyn, who had arrived to warn the family about Charlie's true nature. India soon discovers that her uncle is a manipulative sociopath with a dark history of family violence—having murdered his own younger brother as a child.

: Her transition to adulthood is completed not by escaping the violence, but by embracing it.

The tension culminates when Charlie's intentions toward India and Evelyn become increasingly violent. In a shocking climax:

Rather than being horrified, India finds herself increasingly drawn into Charlie’s orbit. The film explores their unsettling bond, suggesting that India may share her uncle's predatory instincts. This connection is often depicted through symbolic imagery, such as a spider crawling up India's leg or the sound design emphasizing her acute hearing.