Dr. Samantha Walters is a criminal profiler - a detective who profiles an unknown criminal by analyzing the crime scene, and the way the crime was performed. Samantha works for the Violent Crimes Task Force, who helps aid the FBI in solving crimes. Throughout the series, a man who is only known as Jack Of All Trades haunts her, (he slaughtered her husband years before), and she continuously tries to profile him, and find out his true identity.