On Halloween, Jerry and his friends search his childhood camp for evidence to a murder he witnessed as a boy; McGarrett investigates a little girl who drew pictures depicting the scene of a recent murder before it was discovered.
The team investigates a home invasion that turned deadly after a dangerous "monster" escaped from the basement; Max returns to Oahu with a very special guest.
Subtítulo
He 'oi'o Kuhihewa; He Kaka ola i 'ike 'ia e ka Makaula
The team heads to Washington, D.C., to protect Ortiz's former informant after a hit man tries to kill her; Sarah helps Jess' family prepare for Byron and Marie's last-minute wedding on Jess' farm.
Mac, Jack and Riley set out to find a mobster-turned-informant after he's kidnapped and taken to Chernobyl by an international crime boss; Bozer struggles to keep a secret from Matty.
As Mac and the team investigate the suspicious death of Dawn's CIA supervisor, the evidence leads to a dirty CIA agent and a massive counterfeiting ring.
Mac and Riley are called in to examine a mysterious object that crash-landed in the Nevada desert; Riley uncovers new information about Mac's father but questions whether to deliver it to him after he says he needs to move on.
A man who believes himself to be the brother of Dr. Tara Lewis arrives in town, knowing everything about Tara's family; Tara is unable to make contact with her real brother.
While conducting a profiling course on his birthday, Rossi gets a call from serial killer Tommy Yates, who gives him the location of his latest victim.
The BAU investigates when a bizarre hieroglyph is found under a deceased homeless man's armpit; Reid decides to take his mother out of a clinical study early to bring her home.