Convicted murderess Grace Marks is interviewed by Dr. Simon Jordan. He becomes conflicted by Grace's enchanting, persuasive nature and her claims of having no memory of the events surrounding the murder.

In 1859, Simon dissects the events of the murders, while in 1842 Grace befriends Mary Whitney, whose death from a back-alley abortion traumatizes Grace to the point of hysteria.

In 1859 Simon attempts to extract Grace’s repressed memories of the murders. In 1842 Grace begins work as a servant at the Kinnear farmhouse.

In 1859 Grace is convinced to try neuro-hypnosis to recover memories.

In 1859, Simon joins the Union Army, while in 1872 Grace gets unexpected news and makes a decision about her future.