The BAU searches for an UnSub who is purposely disfiguring victims. Also, Rossi has an awkward reunion with his ex-wife, Hayden Montgomery, who kept his daughter, Joy, a secret from him for nearly 30 years.
Gibbs and Fornells crusade to find the head of the drug ring responsible for Fornells daughter Emilys overdose comes to a climax. Also, Gibbs and Vance finally let the team in on a case that has dangerous implications.
While Five-0 hunts for a notorious criminal who has never been seen, Kono must fight for her life when she discovers the villain's identity. Also, Kono confesses to Adam that she's conflicted about their future together because of his ties to his formerly corrupt family business. Michael Imperioli guest stars as a street-wise barbershop owner.
Will decides to trust an old friend in the Santa Monica bloc. Jennifer pays Katie a visit. Bram meets the camp commandant.