Episode 9 : Mai ka po mai ka ?oia?i?o
A renowned urban vigilante is killed after making another citizen?s arrest, and Five-0 delves into the world of super heroes and comic books to find the killer. Also, Adam finally gets closer to finding out who killed his sister.
Episode 10 : Pio ke kukui, p??ele ka hale
After fighting off an assassin in his own home, McGarrett and Joe White (guest star Terry O?Quinn) flee to Montana to prepare for a battle against those exacting revenge for a past SEAL mission.
Episode 11 : Hala i ke ala o'i'ole mai
Still reeling from the murder of one of their ohana, Steve and Catherine, along with Danny, Junior and some old friends, Harry Langford and Wade Gutches, hunt down the killer. Also, Tani and Grover investigate when a bag of human bones, discovered inside an abandoned storage locker goes missing.
Episode 12 : Ka hauli o ka mea hewa 'ole, he nalowale koke
MacGarrett and Five-0 support Danny and Rachel (Claire van der Boom) by determining what happened when Grace (Teilor Grubbs) gets into a life-threatening car accident and lands in critical condition. Also, Tani helps Koa (Kunal Sharma) when his rehab patient goes missing.
Episode 13 : Ke Iho Mai Nei Ko Luna
Adam, Junior and Tani travel to the bottom of the Pacific Ocean when a murder takes place in a remote underwater lab, and the killer may still be on board.
Episode 14 : Ikiiki i ka la o Keawalua
While investigating Flippa's friend's murder, McGarrett and Grover uncover a deadly plan by an extremist group on the Island. Also, Grover has an emotional reaction to the case.