Cabe's ex-wife needs the team's protection after she discovers evidence that suggests a prominent congressman's death involved foul play.
Following a series of fatal shootings, the BAU team travels to Illinois to investigate what appears to be a copycat serial killer.
Bonnie is upset when her brother is arrested and calls Adam instead of her to bail him out; Christy gets fired from her job at the restaurant.
While Gibbs attends the memorial service for a friend who was lost at sea, he discovers that the deceased has been hiding in a fallout shelter after his boat was attacked and he swam to shore.
Adam and Andi attempt to spice up their social life by making new friends.