In Victorian London, innocent shop girl Constance falls in love and marries Dr. Joseph Barton, a medical researcher. She has a sexual awakening with her husband, but their passion is cut short after the life-threatening birth of daughter Angelica. Their puritanical doctors order abstinence, condemning Constance for lascivious appetites.
Sexual repression leads to obsession, and Constance becomes increasingly protective of Angelica. Joseph's secrets fuel the growing conflicts. Then, late at night, the household is disrupted by what appears to be a paranormal predator.
The eerie visits multiply, evermore menacing and vividly evoking Constance's deepest fears. To cleanse the home of its terrors, she reaches out to spiritualist Anne Montague. But the arrival of this charismatic woman brings even more complexities to the deteriorating Barton household.
Constance places her deepest trust in Anne, and together they fight against a force that may be more sinisterly human than supernatural.