The story follows a young woman named Casey Beldon, who starts experiencing haunting visions and physical torment that she cannot explain. Initially, these phenomena seem like nightmares, but they soon manifest in her waking life as well, leading her to believe that a supernatural force is targeting her. Seeking answers, she discovers a family history she was previously unaware of. This revelation comes after she finds an old photograph that uncovers her family's dark and secret past. The photo leads her to learn about a twin brother she never knew she had; a brother who died in the womb. As her investigation deepens, she comes to realize that the hauntings may be connected to the soul of her deceased twin seeking to be born so it can transfer to the world of the living.

Determined to stop the malevolent entity, Casey turns to spiritual advisors and experts in the supernatural, one of whom is Rabbi Sendak, who believes her experiences may be tied to a curse that transcends her family history. Together, they uncover a disturbing connection to Nazi experiments and Jewish mysticism, hinting at a much darker force at play than Casey initially thought. As they delve deeper into this mystery, they come to understand that combating this evil will require a significant spiritual confrontation. Facing this, Casey must muster all her strength and courage to protect herself and those she loves from an otherworldly threat that seeks to consume her from within.