A new ally helps McGarrett and the team when mob bosses on the island are targeted by an assassin; the team says goodbye to one of its own.

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Tani and Junior must plot an escape for themselves and several civilians after they become trapped inside a deadly tunnel collapse; Eddie the dog sniffs out a bomb that has been planted in McGarrett's home.

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A plane that mysteriously crashed into the Pacific in the '80s is found, but with a recently murdered scuba diver inside; McGarrett and Quinn zero in on who planted the bomb in his garage; McGarrett formally asks Quinn to join the team.

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Five-0 enlists imprisoned hacker Aaron Wright to help when a young girl is reported kidnapped.

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Five-0 investigates a deadly home invasion after an extremely dangerous prisoner escaped from the basement. Max returns to the island with a guest.

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A deadly hit-and-run involves a driverless car carrying heroin; Tani and Quinn are stuck with a pair of YouTubers who are brought on a ride-along.

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When the CIA informs McGarret that his mother has gone rogue on her undercover mission and may have killed her partner, Steve goes solo to Mexico to bring her home and prove her innocence.

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Five-O teams up with a DEA agent to search for a killer whose plane crashed in the jungle with $10 million worth of heroin on board. Also, Grover is thrilled when his niece Siobhan comes to try out for the University of Hawaii basketball team.

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It's Thanksgiving, and while Junior and Tani track down the thief who robbed his parents' home, Five-O investigates the murder of a beloved philanthropist and the theft of his ultra-valuable koa tree. Also, Danny moves in with McGarret.

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When Adam's girlfriend, Tamiko is kidnapped right in front of him, he shuts out Five-O and breaks all the rules in order to get her back. Also, Five-O investigates three seemingly unconnected homicides.

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A tourist helicopter is shot down by a missile; a search for stolen artillery leads to a ghost from McGarret's past -- Wo Fat; Adam makes a bold decision about his future.

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Five-0 enlists the help of Thomas Magnum to retrieve a stolen list of undercover CIA agents.

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Grover and the team investigate a murder at a private golf course involving a man who was frozen to death in the locker room's cryotherapy chamber; McGarrett tags along with Danny to a school meeting.

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Soon after Danny meets the girl of his dreams, they get into a potentially fatal car accident in an area far from help. Also, McGarrett enlists Quinn and Tani to help when Eddie the dog suddenly shows signs of PTSD.

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When Grover's niece, Siobhan goes missing from the police academy and it's discovered her boyfriend is an undercover member of the Yakuza, Adam may be her only hope of rescue.

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On Valentine's Day, Tani and Noelani are held hostage during a convenience store robbery. Also, Five-0 investigates the murder of a Thai diplomat whose wife confesses to the crime, but Danny suspects she's covering for the real killer.

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Harry Langford helps Five-0 investigate a series of murders that follow the plot of a fabled unpublished crime novel from the 1920s. Also, Tani and Junior's friendship takes a meaningful new turn.

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Dr. Noelani Cunha's uncle dies mysteriously and she sets out to discover what really happened to honor his memory, and arrest his murderer.

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Five-0 investigates when a rancher is murdered after he uncovers human skeletons on his property where legend says that Civil War-era gold coins were buried. Also, Quinn's former stepdaughter, Olivia (Siena Agudong), reaches out to her for help after her father doesn't come home.

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The team investigates a scheme to rob tourists; Tani helps Girard Hirsh prove the innocence of his elderly uncle when he's suspected of murder; Tani and Junior work on the nuances of being in a new relationship.

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After Steve receives a posthumous letter from his mother that contains a cypher, Danny is attacked by someone willing to kill to steal it. Also, Five-0 must help Lincoln Cole (Lance Gross), an anonymous good Samaritan who's in the crosshairs of some very dangerous people

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Danny is abducted and badly wounded by Wo Fat's wife, who is after the cypher Steve's mother left him. Also, Steve finally solves the case his father left for him 10 years ago.

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