A determined psychology student embarks on a quest to heal her sister from a debilitating psychosis, but their journey leads them to a darker reality. As they delve into the roots of the disorder, they unwittingly awaken an ancient entity that seeks to ensnare their souls. With time running out, the sisters must confront the terrifying force that threatens to consume them both, testing their bond and strength as they fight for their lives against an unimaginable evil.