McGarrett is suspicious of an aide who arrives in Hawaii to retrieve millions of dollars held in trust for a Southern Asian state. He must prevent a daring gold robbery.
A aging crook decides to use dollar-bill printing plates he made to raise cash for a charity, but he fails to realize the trouble that this will cause.
When a rich socialite is kidnapped, her husband insists that Five-O stay out of the case. However, his reasons may not all be on the level as events take a series of twists and turns.
When two healthy young people die mysteriously, local traditions prevent autopsies. A strange conspiracy is gradually uncovered when Truck seems to fall under the power of a Kahuna.
A group of terrorists capture a female officer and use her to further their aims. McGarrett and the team must find a way to take them out without endangering the life of Officer Dean.
When a woman is stalked by a strange figure, she seems to be seeing things and her friends are worried as to her mental health. However, events prove her case and an accomplice is revealed.
Tony Alika and Guido Marioni, killer of Kimo's family, together hatch a plot to frame and embarrass the Five-O team by making them look stupid or corrupt.
Jessica Humboldt, an astrologer and friend of Agnes DuBois, comes to McGarrett with news that a forthcoming match will be disastrous for a boxer. McGarrett must overcome his suspicions and crack the case.