 A Hawaiian bigshot puts McGarrett under "kapu" (meaning no-one of Hawaiian blood can have any interaction of any kind with him), forcing him out of the investigation of a Mafia infiltration of a union. But James Carew, who gets the nickname "Kimo" in this episode, continues on his own, trying to intimidate the kumu mob boss and rein in the native Hawaiians going on a rampage against organized-crime activities in Honolulu.