Hahai i nā pilikua nui (Hunting Monsters)
McGarrett and Five-0 once again become entangled in the twisted mind games of serial killer Dr. Madison Gray when she stumbles into HPD covered in blood that matches Alicia Brown's, and claims amnesia.
Episodes
21
Ua maloʻo ka wai (The Water Is Dried Up) 43
McGarrett and Five-0 are captured and face certain death after tracking a dangerous nemesis to the Island of Lanai. Also, Grover takes his son to Chicago where he testifies against a dirty cop from his past.
22
Waimaka ʻeleʻele (Black Tears) 44
While working the murder case of one of the last survivors of the USS Arizona, McGarrett learns about his grandfather’s important role at Pearl Harbor. Also, Adam uncovers bone fragments at his new construction job and asks Jerry to help him discreetly investigate.
23
Wehe ʻana (Prelude) 42
Danny protects a coma patient showing signs of waking who was the key witness from his last HPD case before he met Steve and joined Five-0.
24
He keʻu na ka ʻalae a Hina (A Croaking By Hina’s Mudhen) 43
When McGarrett gets a tip that someone is plotting a terrorist attack on Oahu, Five-0 searches for those behind it before it’s too late. Also, Chin and Abby have a very difficult decision to make.
25
Ua mau ke ea o ka ʻaina i ka pono (The Life of the Land Is Perpetuated in Righteousness) 43
McGarrett risks his life when Five-0 attempts their most dangerous rescue yet of young girls trapped in the sex trafficking ring they have been tracking this year. Also, Kono, deeply affected by the case, makes a life-changing decision.
