Five-0 helps the CIA search for a killer on the island as the third season ends. Meanwhile, Kono goes on the run when she is accused of a murder that she didn't commit; and McGarrett makes a shocking discovery when he visits Wo Fat in prison.
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McGarrett helps his mother execute a covert operation to retrieve an incriminating microfiche. Meanwhile, Kono closes in on Adam's secret.
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The body of a girl who was kidnapped 10 years ago is found. Five-0 searches for the culprits, who have now taken their next victim. Meanwhile, Kono asks Catherine for a favor that could potentially harm Kono's relationship with Adam.
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A talk-show host and her crew follow Five-0 for a day during an investigation, but the situation becomes dangerous when McGarrett's team has an encounter with Wo Fat.
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McGarrett and Catherine head into North Korea to retrieve a fallen friend's body. While there, McGarrett recalls his last perilous mission in the country. Jimmy Buffett guest stars.
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Five-0 investigates when a tour company that is endangering the local shark population receives deadly threats. Meanwhile, Kamekona tries to earn his helicopter pilot's license.
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Catherine works undercover at a local roller derby to find a killer after a victim falls onto Dog the Bounty Hunter's SUV.
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A star football player helps Five-0 investigate the murder of a tech executive during Pro Bowl weekend.
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Five-0 investigates the murder of a traditional Hawaiian fighting master. Meanwhile, McGarrett hires a private investigator to follow his mother.
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Hookman
Season 3, Episode 15
A mysterious man targets select police officers and it's learned that McGarrett is next on his hit list.
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The team investigate the murder of a prostitute who was found in the bed of a missing congressman. Elsewhere, Danny goes to court to find out if he will get partial custody of Grace.
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Chin is kidnapped in the middle of the night and placed in a prison dressed as an inmate. He must escape before the other prisoners realize he is a member of Five-0.
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A college professor's murder is investigated, and the chief suspects include the victim's boss, a teaching assistant and a student who was caught cheating by the teacher.
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McGarrett and Catherine try to help a boy whose father disappeared and may have gotten into some deadly trouble in the backwoods of Oahu.
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A camping trip turns deadly when an armed man takes McGarrett and a girl hostage. Meanwhile, Adam introduces Kono to his dangerous brother who was recently released from prison.
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Max and a cute bank teller he's attracted to are put in harm's way during a botched bank robbery. The investigation reveals that the thieves had unexpected motives for attempting the heist. Meanwhile, Danny protects a model from a stalker.
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McGarrett investigates a seductive therapist he believes killed her patient. Meanwhile, Catherine searches for one of Doris' former targets who is now seeking revenge.
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Five-0 investigates the murder of a computer hacker. Meanwhile, McGarrett tries to stage a reunion between his mom and his sister.
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Danny is forced to remain perfectly still while explosives experts disarm a bomb that he accidentally activated. To keep him calm, McGarrett distracts him by getting him to tell about the toughest case he ever worked back in New Jersey.
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A grisly murder leads Five-0 to discover a ritualistic killing on Halloween, and the evidence suggests that the murderer will soon strike again.
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The death of a polo player who literally loses his head is investigated. Meanwhile, McGarrett's mother pays him an unexpected visit.
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A relaxing day at sea turns deadly for McGarrett and Danny when their boat is hijacked and they are left stranded in the ocean.
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Five-0 investigates a deadly art heist. Meanwhile, McGarrett searches for his mother and asks Catherine to assist him.
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The third season begins with McGarrett dealing with the realization that his thought-to-be-deceased mother is alive. Meanwhile, Five-0 hunts for Wo Fat to avenge the death of a team family member.
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