As Tamacti Jun’s army nears Baba and family, Maghra’s past comes to light.

The twins struggle to keep a secret from their mother.

An attack on the village leads to sacrifice and new challenges.

An unexpected encounter sparks regret in Grace. Sol acts cagey about his new dog’s origins. A stranger’s ambush of Coyote leads to a revelation.

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.

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.

Holden develops a controversial profile in the Atlanta slayings. Wendy conducts her first interview and finds being on the front lines suits her well.

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

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

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.