After multiple people are targeted and killed with a poisonous gas in broad daylight, the team races to find the killer, who they believe is tied to an eco-terrorist plot. Meanwhile, Maggie continues to explore motherhood.

After an employee of the U.S. Army is shot in an industrial park, the team works to track down the killer who reveals a larger plot at play. Meanwhile, Tiffany continues to struggle with the guilt surrounding Hobbs' death.