A series of mysterious events begin to torment the Hodgson family, prompting inventor Maurice Grosse to investigate.

The frightening occurrences seem to target 11-year-old Janet. As word spreads, psychic investigators and physicists flock to the house.

Skeptics challenge Maurice's claims as the family deals with accusations that they're faking the phenomena.

Young Janet is sent away. As an adult, she reflects on what happened to her and the impact of Maurice's investigation.