Magnum is caught in the crossfire of international politics and terrorism when a determined news correspondent that himself, T.C. and Rick met in Vietnam, arrives in Honolulu, asking his help in tracking down a master-of-disguise international assassin who is targeting a visiting Prime Minister of a small island republic. But as they try to locate the killer before the assassination attempt is made, Thomas begins to question the exact motives behind the reporter's extreme determination to get the story...

A Vietnam veteran, whom Thomas distantly knows from a mission they both served on during the war, hires him to supposedly find his missing girlfriend. But unbeknown to Thomas, the man actually has an ulterior motive, and is using him to track down an old adversary with whom he has an old score to settle over the death of an Army buddy...

Higgins finds himself quarantined with Thomas in the guest house after Thomas' supposed exposure to 'African Hemorhragic Fever'. Unbeknown to Higgins, the enforced quarantine is actually a ruse organised by Magnum and a one of Higgins' former comrades, to try and protect him from Kenyan Mau Mau warriors who are seeking bloody revenge and one-by-one killing all members of Higgins' old Army regiment who, in the 1950s, were responsible for the destruction of a Mau Mau village...

A hurricane battering the islands isn't enough to stop Robin Masters's spring equinox party, a lavish event attended by a close circle of friends, but the arrival of an about-to-give birth young woman and two ex-cons intent on grand larceny does. Further complicating matters is Robin's assertion that one of his guests is plotting to kill him that evening, and Thomas's plans to trap the culprit with the help of Rick and T.C. have been foiled by both the weather and the intruders.

Thomas's attempt to impress a new girlfriend by taking hang-gliding lessons lands him in the hospital with a broken shoulder; Rick bails out his childhood friend Waldo Norris on a breaking and entering charge, but Waldo insists that he's an insurance claims investigator trying to prove that a valuable figurine that was reported as stolen is still in the possession of its owners; after they get shot at by a man ransacking Waldo's hotel room, Rick does a little digging and discovers that his friend has been lying to him, and has also stolen one of Higgins's sketches by conning him into thinking that he's a representative of the Smithsonian; Waldo then confesses that he's really a CIA operative and the figurine contains sensitive information; after some further checking, Rick is able to verify his story, and Higgins and T.C. agree to help Waldo and Rick -- that is, until Thomas does even more checking and discovers that Waldo was fired from the CIA years before; Waldo then claims that he

Diane's suicide triggers memories of others that Magnum has loved who have been killed, sending him into a spiral of depression, with him fast becoming a drunken wreck. While driving through town, he catches a glimpse of a man in who looks exactly like his late friend Mac MacReynolds. Higgins, Rick and T.C. are concerned about the effect of Diane's suicide on Magnum, but Thomas is adamant that he isn't going around the bend and intends to prove to his friends and to himself that he's not going insane. But if Mac is dead, just who did Magnum see?

Thomas arrives in Los Angeles to deliver lawsuit papers to a small film company on behalf of Robin Masters, and during the trip befriends a stand-up comedienne. But when he finds her murdered in his hotel room, he investigates to find who is behind the killing. When he goes to deliver the subpoena to the film company, he strikes up a relationship with the attractive young attorney, and the pair work together to find the murderers... Meanwhile back in Hawaii, one of the players on T.C.'s baseball team is mixed up with some small time car thieves, who witnesses his friends being shot dead after stealing a car...

Conclusion of this feature-length / two-part story. Magnum and Cynthia became ever closer to each other as they investigate Marti's murder. Their search leads them to a drug trafficker, but their snooping around sees them almost killed. Back in Hawaii, T.C., with help from Rick and Higgins, continues to search for the missing Kenny, and get him out of the trouble he is in...

It is almost the 4th of July, and Higgins heads to Maui for an annual writers conference, and Rick and T.C. take a trip away, leaving Thomas on the Estate to face the horror of his tax audit. But that's nothing compared to the terror yet to come when Magnum becomes the focus of a crazed, obsessed killer, who repeatedly phones him with cryptic nursery rhyme riddles of upcoming killings. At first he thinks it is a crank caller, but the full reality of the sitution hits home when a prostitute is murdered in circumstances reflecting the clues given, and the menacing calls continue, with the deranged killer boasting about his crimes and giving clues of the next one...

Rick persuades Thomas to take a lucrative, straightforward missing-person case. But the client, a New York City cop, is secretly out to avenge his young granddaughter -- and he wants Magnum's help.