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To glean insight into the elusive BTK killer, Bill and Holden interview the Son of Sam, who makes a startling admission.
Amid sweeping changes at the BSU, Holden deals with severe repercussions from his close encounter with Ed Kemper.
Bill gets drawn into a horrifying crime that hits close to home. Holden receives an intriguing offer while in Atlanta to interview a pair of killers.
The Behavioral Science Unit's killer instincts move from theory into action when the FBI joins in a high-profile hunt for a serial child murderer.