After the death of her secretive mother, Annie Graham struggles with the complex legacy of a family she didn't fully understand. As an artist who creates miniature dioramas reflecting her life, Annie channels her grief into her work, seeking control amidst growing chaos. Her husband, Steve, is a supportive but increasingly distant presence, attempting to maintain stability for their two children, teenage Peter and the peculiar Charlie, who was particularly favored by their late grandmother. The family experiences a series of strange occurrences, and Annie’s attempts to probe into her mother's past only unearth more questions. She starts attending a support group for grieving relatives in an attempt to find solace.

The family's dynamic starts to unravel as unspoken tensions between Annie and Peter come to the surface. Charlie's behavior becomes more disconcerting, and Annie feels the strain of her troubled relationship with her daughter, not fully understanding the girl's peculiarities and the extent of her grandmother's influence. A traumatic event sends shockwaves through the family, amplifying their grief and guilt. Annie's descent into her family's ancestry reveals a dark and troubling history—one that threatens to engulf them all. As disturbing events escalate, the Grahams confront the possibility that a sinister and supernatural legacy has been passed down through the generations.