The cases of the FBI Behavioral Analysis Unit (BAU), an elite group of profilers who analyze the nation's most dangerous serial killers and individual heinous crimes in an effort to anticipate their next moves before they strike again.
Based on the true story of Grace Marks, a housemaid and immigrant from Ireland who was imprisoned in 1843, perhaps wrongly, for the murder of her employer Thomas Kinnear. Grace claims to have no memory of the murder yet the facts are irrefutable. A decade after, Dr. Simon Jordan tries to help Grace recall her past.
As a prison riot erupts into violence, Red comes face to face with the ring leader: the man who once held him hostage and nearly drove him mad. But what they don't know is a killer's amongst them, preying on their weaknesses.