When Jane Lawless finds a gun in her dead partner's briefcase, she begins to wonder about Christine's involvement in the most infamous murder case in Minnesota history. On a sultry summer evening in late August of 1987, the Simoneau mansion was the site of a bloody triple homicide. In the weeks prior to that night, Christine had been working with the family as their real estate agent. As Christine lay dying in a hospital bed, the murderer was arrested. The trial was quick and final, the murderer sentenced to three consecutive life terms. Now, as Jane begins an emotional journey into her partner's past, she comes face to face with some hard truths—truths not only about the real identiy of the murderer, but about her own life and loss.