Red tape hinders Holden’s plan to narrow his suspect pool. A weary and heartsick Bill tries to connect with his son. Wendy rethinks her relationship.

The investigation zeroes in on a prime suspect who proves surprisingly adept at manipulating a volatile situation to his advantage.

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.

Bill’s devastating family situation spills over during his interview with Holden’s holy-grail subject: Charles Manson. Wendy’s new romance heats up.

Bill and Holden consult with Dr. Wendy Carr to begin classifying their subjects. They receive surprising news.

The FBI officially sends the BSU to Atlanta to investigate the missing and murdered children. Wendy second-guesses her interview methods.

Wendy considers an offer. Holden and Bill struggle to communicate the meaning of their findings to the judicial system in the baffling Altoona case.

Hitting a dead end, Holden suggests a bold plan to draw the killer out. Bill’s family faces more scrutiny. Wendy chafes as her job begins to shift.

Amid sweeping changes at the BSU, Holden deals with severe repercussions from his close encounter with Ed Kemper.

To glean insight into the elusive BTK killer, Bill and Holden interview the Son of Sam, who makes a startling admission.