Greggs, a land developer has a zoning man, Huffman in his pocket. But because Huffman starting offering his services to other developers, 5-0 has built a case against him. Greggs knowing that Huffman will turn on him to save himself, calls him telling him to meet him. But instead Greggs sends one of his men, Koa to meet him. Koa kills him and was about to leave when a car drives off. It seems like a film maker saw Huffman's car and took his wallet. He dropped one of his film cans. Koa finds it and gives it to Greggs who has it developed and sees it's footage of a ...
Con-artists arrive in Hawaii and meet up with local thieves to plan a phony diamond con. When a wealthy tourist devastated by the con leaps to his death, McGarrett discovers he is one of many victims. As another angry victim seeking revenge and Five-O close in on the gang; the crooks turn on one another.
Five-O races to find the witness to a hit on a bagman of a local mob. The witness, who narrowly escaped being killed himself, had dropped a library book with his library card inside, providing the hitman with the name of the witness. The witness's wife doesn't want him to go to the police. Five-O's main clue is a letter the witness wrote to the Honolulu Star-Bulletin's "Secret Witness" feature that seeks tips for unsolved crimes.
McGarrett joins a group of operatives trying to take down a major drug lab in the hills. The raid succeeds, but a young man smashes through a cordon in a truck and escapes. Word of the raid soon reaches a retired HPD cop, who realizes the escapee is his own son. The cop starts sneaking into evidence rooms and destroying or stealing anything which can implicate the son. Meanwhile, the son is still working as a drug dealer and holes up in another lab used to make methamphetamine. The title of this show is to be taken literally.
A private detective, and former HPD officer, turns up dead. Following his trail, Five-O discovers the private detective was investigating whether a businessman's son-in-law was being faithful in his marriage. It turns out the son-in-law is up to his neck in a scheme to steal gold from the businessman, melt it and recast it and make it appear to be a treasure find. Things will turn more deadly before Five-O can crack the case.
Steve and the team are looking for the man who is sexually assaulting and killing women. He's killed four and there are no leads. His latest victim doesn't die but is unwilling to help. Steve knows that a couple of the victims were having problems with their cars so he places policewomen in position and to await him to make his move. But when a cop approaches one of them, she tells him that she's on a stakeout so he leaves. But when they realize the cop is the one they are looking for because the victims either went with him in his car or allowed him to enter their ...
A vicious law-and-order zealot becomes inflamed by various thugs getting off the hook in court on technicalities. So, using an alias, the man sends a letter to McGarrett promising to blow away the next criminal who takes a walk -- naming a specific hood in particular. The criminal walks and is drilled right in front of the courthouse. As a public debate rages on vigilante "justice," the killer sends McGarrett another note, expanding his hate list to the judges who order charges quashed on technicalities. A judge (Frank Cady of Hooterville fame in a very rare serious ...
Five-O matches wits with a brilliant thief who's a master of disguise and able to manufacture his own pass keys to Honolulu hotels. The thief has information on guests with valuables and how they try to hide them in their rooms. He even calls the police while disguised as a priest claiming to be robbed himself. The question is whether McGarrett & Co. can catch up to the thief.
A band of young radicals is killing ordinary people at random. Five-O consults an academic who is knowledgeable about such groups. The group then kidnaps Dan Williams and the academic, threatening to kill both men.
A man who's an expert in both geology and explosives, owes loan sharks more than $72,000. He has planted explosives that, if set off, will cause volcanic eruptions and is demanding $500,000 from the state of Hawaii. He has killed accomplices and is prepared to go through with his threats. But he doesn't know his fed-up wife is preparing to double cross him.
A nerdy bookstore clerk with an obsession for McGarrett turns deadly as he re-creates some of Five-O's most famous cases that were covered in a series of magazine articles. He is so brazen that he even calls McGarrett to brag about his crimes and sends him notes. Now McGarrett and the rest of the Five-O team must find the killer before he strikes again.
Colby runs an operation that fences stolen goods with retailers enticed by too-good-to-be-true prices. Five-O enters the case when the body of a federal law-enforcement agent -- killed during a robbery on the Mainland -- is discovered in a refrigerator shipped to Hawaii. McGarrett & Co. turn up the heat as the body count increases.
A current wave of liquor store robberies and shootings are strangely linked to a fiveyear old bank robbery in which neither the quarter-million-dollar booty nor the thief was ever found. Charles Cioffi guest stars as an HPD officer, who, when the link in the crimes is uncovered, desperately hunts for the man behind the liquor store crimes.
A politically powerful Big Island rancher learns that his son was killed by a blow to the head. The son was involved in a fight outside a barroom with a local. The local is arrested and, over the rancher's strenuous objections, charged only with manslaughter. The rancher plots to break into the jail and kidnap the suspect, hide him on the huge ranch and ceremoniously hang him from a tree. While Five-O frantically searches for the unlucky suspect, McGarrett finds a rock at the crime scene with blood on it. "This wasn't manslaughter, Danno ... this was murder one!" He ...
A Honolulu businessman is found murdered on a land tract he was trying to develop. The case has all the earmarks of a syndicate hit. Five-O traces the dead man and finds that he was, in fact, a former thug who had testified and gone into the Federal witness protection program. But they find this out so easily that McGarrett begins to suspect that the mob had nothing at all to do with the murder -- someone close to the witness, who knew all about his history, killed him and pinned it on the mob. Suspicion soon falls on the dead man's wife and her lover, who were to be ...
Thugs break into the heavily-guarded art room of a multimillionaire and steal a Gauguin painting worth a fortune. When Five-O comes to investigate, the millionaire, his secretary and his grandson (who are the only inhabitants of the mansion) are surprisingly uncooperative. It turns out that the old man had been planning to sell the painting and had hired two art appraisers to market it. Soon, the group receives a ransom demand. The grandson figures out a way to pay the ransom despite intense Five-O surveillance -- with grandfather, grandson and secretary all leaving ...
A plaque, an award for his work in law enforcement, arrives in McGarrett's office and promptly explodes, killing one officer and injuring McGarrett. The perpetrator soon discovers McGarrett survived and begins planning his next attempt.
A pair of con men sneak into Five-O' headquarters at night to photograph the layout of the offices. They then use these photos to duplicate the offices in an abandoned building, and also hire actors to impersonate McGarrett and the other members of Five-O, as part of an elaborate scheme to extort money from businessmen who may not be aware of the real location of Five-O, nor personally acquainted with its top operatives.
A top Chinese official is visiting Hawaii for an important conference. He wants to visit the circus, creating a massive security headache for Five-O. Meanwhile, Wo Fat has now broken from the Chinese government. He opposes how China is "on bended knee" to negotiate with the United States. As a result, Wo Far has organized a complicated assassination plot.
A shamed Japanese banker ritualistically kills himself, and McGarrett want to know why. McGarrett demands answers from a prominent financial consultant, played by guest star Ossie Davis, and the deceased's assistant when Five-O discovers the pair are involved in an international swindle.