In 1965, rebellious teenager Heather Fasulo finds herself in a precarious situation after she sets fire to a tree in her backyard, prompting her estranged mother, Alice Fasulo, and negligent father, Joe Fasulo, to send her to the isolated Falburn Academy. Despite her father's poor financial status, the headmistress, Ms. Traverse, takes Heather in, creating a new chapter in her turbulent life.
Once at Falburn, Heather quickly forms a bond with her fellow student, Marcy Turner, but their friendship faces trials as they deal with the relentless bullying from their cruel classmate, Samantha Wise. As the nights roll on, Heather is plagued by a vivid nightmare involving a bloodied student named Ann, who seems to beckon from the very shadows surrounding the school. Marcy informs Heather that Ann had been institutionalized following an attempted suicide, with Heather absorbing the chilling tale of her past.
Though initially an awkward newcomer, Heather gradually starts to find her footing at Falburn. With Marcy's support, she begins to enjoy her time at the academy, but dark clouds loom as Ms. Traverse subjects her to various “gifted” tests, all dressed up as part of her scholarship program. The girls share eerie stories about Falburn's history, which suggests a sinister legacy involving three redheaded sisters who were rumored to be witches. These sisters allegedly killed a former headmistress and vanished into the woods, leaving a legacy of fear behind.
As the tension rises, Heather’s disdain for Samantha grows, and in a shocking twist, Samantha reveals her protective motives behind her obnoxious behavior. She warns Heather of the coven of witches controlling the school and even claims to have contacted Heather's father for help. However, disaster strikes when both girls are caught by a school mistress, leading to Samantha's tragic demise.
When the police come probing into the disappearance of the students, Heather bravely confronts the headmistress but is met with denial. As more girls vanish mysteriously under Ms. Traverse's watch, Heather's desperation grows. After a series of harrowing events, including a near-fatal accident involving her parents, Heather awakens in a nightmarish captivity, bound by living vines alongside Ann and Marcy.
In a shocking revelation, the chilling truth comes to light: all the teachers are witches, seeking to entrap the spirits of young women to escape their eternal prison. With Heather seemingly at the center of their dark rituals, she realizes her formidable powers make her the perfect vessel. In a climactic battle against her captors, her father rushes in to aid her with an ax and the two fight back against the witches together.
In a gripping finale, Heather seizes the ax and, with fury, dismantles the malevolent force that haunted Falburn. Rescuing the remaining girls, she and her father step into the light as the nightmarish school is engulfed in flames behind them. The film closes with a haunting reminder that Falburn Academy burned to the ground in 1965, its sinister woods inexplicably left in peace.
