Outside London behind a stone wall stands Lake House, a private asylum for genteel women of a delicate nature. In the winter of 1859, recently-married Anna Palmer becomes its newest arrival, tricked by her husband into leaving her home, incarcerated against her will and declared hysterical and unhinged. With no doubts as to her sanity, Anna is convinced that she will be released as soon as she can tell her story. But Anna quickly learns that liberty...