Hawaii Five-0 - Season 8 Episode 3
Kāu pahi, ko’u kua. Kāu pū, ko’u po’o. (Your Knife, My Back. My Gun, Your Head.)

Five-0 enlists the help of an old friend when the boss of a major crime family is murdered, triggering revenge killings across the island. Also, MacGarrett and Danny begin sorting out particulars in their new restaurant venture,