When people are killed by arsenic poisoning and handwritten death threats are found, the team pursues a suspect fascinated by Greek mythology; Hotch is worried about participating in a Career DY at Jack's school.

As a critically wounded Hotch hallucinates moments from his past, the BAU question a man whose estranged teenage daughter has disappeared.

Sniper attacks in Dallas lead the BAU to consider that the incident is motivated by the approaching anniversary of the Kennedy assassination.

As the BAU close in on the culprit in ritualistic murders in Arizona, they encounter their suspect's mother, who is obviously keeping secrets.

The BAU searches for a serial killer in Glendale, Arizona, and the team believes that Hotch is being groomed to replace the late Erin Strauss.