The BAU travels to Dallas to assist in the search for a murderer who scares his victims with "missing" flyers that display the soon-to-be victims' photos.
When Dr. Alicia Seberg, a government research scientist (guest star Amy Price-Francis), is exposed to a deadly toxin while at work and has only hours to live, she calls Patrick Jane and the CBI to find her murderer.
Marissa and Ryan begin dating. Summer tries to deny her feelings for Seth as he gets closer with Anna. Kirsten and Sandy continue to clash. Julie reveals a new relationship.
J.D.'s brother is in town. He came all the way from their hometown to pick up a car and drive it back for 300 dollars.
A young mother's life is threatened by her ex-husband as their relationship turns deadly. With the determination of one officer and the help of unlikely informants, they uncover a relentless murder plot only an undercover operation can stop.