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Captain Grover must steal $100 million dollars in order to get back his kidnapped daughter.
Steve and Catherine journey to Afghanistan to help a young boy whose family is responsible for saving Catherine's life many years ago.
As Five-0 investigate the death of a pool cleaner, they uncover a group of radicalized students who may be plotting a terrorist attack on U.S. soil.
After following up on a tip, Steve and Danny are trapped inside an abandoned building that is rigged to explode.
The daughter of a macadamia nut tycoon is murdered during Chin's high-school reunion. The investigation reveals that the victim was killed with a stiletto heel.
Five-0 investigate the abduction of a girl from her home which also resulted in her father being shot. Danny attempts to get his parents to reconcile and Jerry makes sense of a code he found on the bottom of McGarrett's champ box.
Five-0 investigates three murders that appear related to a downed top-secret Chinese satellite. Captain Grover lets Clara accompany him on a ride-along.
The team investigate when the body of a real estate agent is found buried at one of his listings. Danny's mother unexpectedly comes to town with some extremely startling news.
An escaped convict out to prove his innocence kidnaps Steve and Danny. Grace punches out another student at school.
The murder of Chin’s father, 15 years ago becomes the focus of Internal Affairs and there are questions regarding Malia’s relationship with Chin and its impact on the prior investigation.
Captain Grover is aided by McGarrett in his search for a friend who has disappeared, after it seems like he's committed murder. Kono persists in her quest to find Adam.
A serial killer at the heart of Five-0's investigation puts Chin's life in danger. While on the shores of Oahu, Danny and Grace come upon an odd puzzle box.
When someone tries to kill a Pearl Harbor veteran, Five-0 links evidence to a crime committed within the internment camps on Oahu during World War II.
With the President on the way to Oahu, Five-0 is tasked with the murder investigation of a secret service agent. Steve's Aunt Deb comes for a visit along with an eye opening secret.
With national security in mind and at the behest of the Governor, McGarrett and Captain Grover set out to serve a warrant on a young computer hacker.
Five-0 is tasked with babysitting Mary's newly adopted baby, even as they investigate the murder of an undercover ATF agent.
Halloween and a shooting have Hawaii Five-0 looking for a man carrying out experiments and turning humans into zombie-like creatures.
Catherine's surveillance job turns deadly. In order to save Kono, Adam reflects on what his best move should be.
A runaway bride is the main suspect when a wedding crasher is murdered. Danny decides where his relationship with Gabby is headed.
To solve a double murder, Five-0 gets some help from a conspiracy theorist.
Five-0 assists a Texas Ranger in finding his missing daughter when they cross paths with him during a murder investigation. Adam and Kono run into problems and find themselves fighting for their lives.
Steve and Wo Fat fight to escape from the attack on the maximum security unit. Catherine is taken hostage when Five-0 headquarters is seized. Five-0 goes behind the new SWAT Commander’s back to rescue Catherine. Kono and Adam find themselves exposed while hiding in Hong Kong.