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What starts as a poignant medical documentary about Deborah Logan's descent into Alzheimer's disease and her daughter's struggles as caregiver degenerates into a maddening portrayal of dementia at its most frightening, as hair-raising events begin to plague the family and crew and an unspeakable malevolence threatens to tear the very fabric of sanity from them all.

Deborah Logan

Sarah Logan

Mia Hu

Harris

Dr. Nazir

Gavin

Luis

Dr. Schiffer

Reporter 1976

Dr. Leder

Cara's Mother

Young Cop