Germaine Scott Grimes

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 Day at Jack's school.

Brenda follows the trail of a suspected sniper who is assassinating members of the East Side Catorces, one of the city's most notorious gangs. When a retired U.S. Marine Corps colonel comes forward at the first crime scene and offers detailed information about the murders, Brenda agrees to work with him secretly to avoid scaring off the suspect.

In Central Park, a young woman is the victim of a brutal assault, but she has no memory of the incident, leaving Stella and the team to try and piece together the evidence. Elsewhere, Mac and Danny are looking into the death of a drug dealer, but the lack of a bullet hampers the investigation.

Lucifer wants Chloe to investigate a shooting at a fashion show, which resulted in a young woman's death; meanwhile, Amenadiel targets Dr Linda Martin.

Jake's return to Jericho after a long absence coincides with a deadly explosion that catapults residents into chaos, as they wonder whether they are the only people left alive.