As children, two siblings witnessed their parents’ harrowing descent into madness and murder. Now, as an adult, Tim is released from incarceration in a mental facility and reunited with his sister Kaylie. Kaylie has tracked down the Lasser Glass, an antique mirror from their childhood, convinced it is infused with evil and responsible for their family tragedy. Years of mandated therapy have convinced Tim the haunted mirror is simply a myth they created to cope with their father torturing and killing their mother. However, Kaylie is determined to document the mirror’s paranormal nature and prove otherwise. As soon as they proceed with Kaylie’s experiment, flashbacks from their horrifying past overwhelm them, and soon they lose grasp of reality. Their hallucinations unravel the sinister truth from long ago, as they confront their past and try to survive the night.