Vincent Bruce, a war veteran, begins working as an occupational therapist at Poplar Lodge, a private psychiatric facility for wealthy people where he meets Lilith Arthur, a charming young woman suffering from schizophrenia, whose fragile beauty captivates all who meet her.

An Irish miser, his morphine addicted wife, their debauched older son, and a gravely ill younger son. A quiet Connecticut vacation home on one foggy day in August 1912 becomes the backdrop for domestic decline.