Ann, a sophisticated and solitary woman with a fascination for butterflies, forms an unusual friendship with the hauntingly beautiful young Alice. Through her alluring innocence, Alice forges a troubling mother-daughter dynamic with Ann. Drawn into Alice’s unsettling world, Ann soon realizes she is not the sole focus of the girl’s attention. When confronted by Alice’s other female companions, Ann’s shock triggers the resurfacing of a dark, buried past, leading to a descent into madness: a series of gruesome and strange crimes that Ann must commit to maintain her seemingly innocent facade. The only person who senses something amiss about Ann is Julie, the nine-year-old daughter of her neighbor. Driven by a child’s natural curiosity, Julie begins to investigate the nooks of Ann’s apartment, uncovering a sinister secret concealed within the walls of the forbidden butterfly room. No one believes her discoveries except for Ann’s daughter, who is horrified to realize that the young girl’s fate rests in her hands.