5x1 – Episode 1
Magnum and Higgins weigh the risks of pursuing a relationship. Rick juggles being a new father and running La Mariana. Katsumoto tries to figure out his next move.
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5x2 – Episode 2
Magnum and Higgins go undercover as lifeguards in order to solve a murder. Jin Jeong wins a storage unit auction and enlists the help of Rick and TC upon finding a stolen military medal.
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5x3 – Episode 3
Katsumoto takes a job providing security for a chart-topping K-pop star. Higgins and Rick find themselves in peril while trying to help Rick's friend. Magnum harbors suspicions about Capt. Greene's death.
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5x4 – Episode 4
Magnum and Higgins search for a CEO who has mysteriously vanished. Rick braces for a visit from his wild-child little sister, Ruthie.
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5x5 – Episode 5
Magnum recruits Katsumoto to help find a missing tourist. Higgins and Kumu attempt to solve the murder of a beloved dog. Rick enlists the aid of TC after he accidentally loses Magnum's pet mouse, Roberto II.
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5x6 – Episode 6
Katsumoto's hearing date arrives and he will learn if his career in law enforcement is over for good or not. Magnum and Higgins are hired to investigate a man their client believes committed murder.
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5x7 – Episode 7
Magnum and Higgins investigate the robbery of an elderly man suffering from Alzheimer's. The ohana tries to help TC overcome a past trauma.
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5x8 – Episode 8
Magnum and Rick make a shocking discovery in the Capt. Greene case. Higgins and TC head to Maui to help an eccentric billionaire find the owner of a pesky drone harassing him. Shammy helps Kumu after an incident occurs at La Mariana.
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5x9 – Episode 9
Magnum and Higgins take on a case that sends Higgins inside a psychiatric hospital. Katsumoto and his son, Dennis, head to the mainland to look at colleges, but their trip takes a harrowing turn when a run-in with a local turns ugly.
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5x10 – Episode 10
An armed hit team lays siege to Robin's Nest. TC is badly injured while Rick fights for his life.
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5x11 – Episode 11
Magnum and Higgins go to work for a dangerous and controversial client; Kumu and Shammy help move TC to a veterans' rehab facility; Rick flirts with a woman who works at the marina.
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5x12 – Episode 12
Magnum and Higgins try to help Zhao, a close friend of Kumu, recover her life savings that was all lost to a scammer. TC becomes increasingly frustrated at the lack of progress in his recovery and pushes everyone away.
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5x13 – Episode 13
Magnum and Higgins enlist Katsumoto to go undercover when a chef at a high-end restaurant goes missing. Kumu works with Cade at the Cultural Center, confronting one of America's darker chapters.
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5x14 – Episode 14
Magnum and Rick race to find a missing witness who can exonerate an innocent man accused of murder. TC tries to repair his relationship with Mahina after being released from the VA.
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5x15 – Episode 15
Magnum and Higgins are hired to find a missing gamer whose online friends believe he might be in trouble. Jin enlists the help of TC in a treasure hunt after his ex-partner gets out of prison.
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5x16 – Episode 16
Magnum and Higgins agree to help a teenage Amish boy who has traveled to Hawaii in search of his runaway sister. Rick sets out to find TC a date to the Marine Corps Ball.
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5x17 – Episode 17
After a high-stakes homicide case falls apart at trial, Katsumoto asks Magnum to help him stop a killer from walking free; Higgins helps Jin Jeong with a mystery of his own.
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5x18 – Episode 18
Magnum and Higgins are hired by a university dean to investigate a professor who has been accused of having an inappropriate relationship with a female grad student. TC and Katsumoto take Cade and Dennis on a father-son camping trip.
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5x19 – Episode 19
Magnum and Higgins reexamine a fatal arson investigation at the request of TC and Mahina, leading to a sinister discovery. Kumu volunteers with Rick at a veterans' crisis call center.
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5x20 – Episode 20
Magnum and Higgins take a major step forward in their relationship. At the same time, the past comes back to haunt them when a previous suspect becomes their client. TC aims to scale up Island Hoppers. Rick gets a new business partner.
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