It is Christmas Eve, and T.C. is flying Rick to judge a beauty pageant, Thomas to play Santa Claus at a charity event, and Higgins to deliver a payroll to some of Robin Master's workers, before he goes home to spend Christmas with his family in New Orleans. But the helicopter suddenly develops problems and they are forced to make an emergency landing on nearby deserted Frenchman's Island. The remote isle is used by the Navy for shelling manoeuvres – and as the foursome try to find a way to safely make it off of the island, hopefully in time for Christmas, a Naval Captain, unaware of their presence, is hell-bent on upping his ship's target practice scores, and a shelling on the island is imminent...

Magnum is hired by a bank teller from Robin Master's bank to investigate her father, world-famous counterfeiter Herbie ""Rembrandt"" Norton, who has recently been released from penitentiary and whom she suspects has returned to counterfeiting after coming into large amounts of money since his release. Before starting investigations, the pair go to retrieve a book for Higgins from a safe deposit box at the bank, but the woman accidentally locks them in the vault, and with the time-release door and a slowly dwindling air supply, the pair are trapped inside... Meanwhile, spurred on by getting the potentially lucrative case, Thomas had promised to take Rick and T.C. for a luxurious weekend away, but unaware that Magnum is trapped in the vault at the bank, they are annoyed to presume that he has gone without them, and - with T.C. having problems with his girl-friend - they decide to hold a party at Magnum's guest house - which does not go down well with Higgins, who is holding a meditation we

T.C. drags a reluctant Magnum along to the newly-opened club of an old flame – a beautiful jazz singer who he fell in love with in Vietnam – who has just moved to the islands. Thomas doesn't dislike the woman, but insists to T.C. that trouble always follows her wherever she goes – but T.C., still infatuated with the girl, refuses to listen. But sure enough, the woman is in trouble, searching for a man who owes her $18,000 and mixed up with Detroit drug dealers that are out to kill her...

When the King Kamehameha Club is robbed late one evening by thieves wearing animal masks to conceal their identities, Lt. Tanaka becomes so frustrated by the inability of Higgins, Rick and T.C. to agree about what transpired that he enlists Thomas's help in getting their stories straight. Since the men tell widely divergent versions of the night's events designed to show themselves in the best possible light as the evening's hero, it takes Thomas quite some time and effort to uncover the inside man at the club who tipped off the robbers.

Carol persuades Magnum to do some work for her, gathering additional evidence for the big murder case of a man accused of killing his wife that is due to come up in court in a couple of days. The only witness of the woman's death is her young daughter, but Thomas faces a crisis of conscience over just what to and what not to present as evidence in the court-room that could ensure the conviction of the violent accused killer... Meanwhile, Higgins, tired of Magnum's slackness around the Estate, has taken use of the Ferrari away from him, so Thomas must find a new vehicle to get around in...

At request of Robin Masters, Thomas begrudgingly is to provide protection for a political candidate whom he has reason to dislike. He is also waiting for a female client, but in her place arrives a young Vietnamese boy, Tran Quoc Jones, who wants to hire Magnum to find his long lost father, a pilot in the Vietnam war. Tran cannot go to the authorities for help as he is an illegal immigrant and would face deportation, and as Thomas does his best to trace the boy's father, he and his friends, especially T.C., become attached to the boy. But Magnum learns that the woman who was originally to have hired him was found murdered - and the politician, the dead woman and the young Vietnamese boy all tie in to the same case...

Carol asks Magnum for help when a series of strange events lead her to believe that someone is trying to scare her. At first she thinks that she just may be imagining it, but as the happenings turn more sinister, her fears grow. It seems that the threats are connected with the leader of a religious group that her father, also a District Attorney, sent to prison over fifteen years earlier, whom she is about to testify for parole to be denied. Meanwhile, Higgins is expecting a visit of three old friends from Sandhurst, but he isn't particularly looking forward to the visit...

Magnum and Higgins travel to London, England to oversee the establishment of Robin Master's new castle, Robin's Keep, in time for a large banquet. While Higgins is busy training Ian MacKerras for the running of the castle, Thomas takes the opportunity to visit Geoffrey St. Clare, an old friend from Vietnam, but upon arrival, Geoffrey's wife Penelope informs him that Geoffrey has been killed, after being run down in a hit-and-run incident with a black Jaguar. But there is mystery surrounding the death - Geoffrey was supposed to be in France, and the circumstances suggest that, far from being an accident, the death was deliberate murder.The events of Geoffrey's killing seem to be echoing a disturbing, bizarre dream that Magnum had on the journey to England...

Conclusion of this feature-length / two-part story. As Thomas and Penelope investigate the mystery surrounding Geoffrey's death, they become close to each other, and Thomas with this and with flashbacks to his haunting dream that seems to have predicted Geoffrey's death, he feels as though he's almost stepped into Geoffrey's life. The pair uncover that Geoffrey was once part of a powerful group of assassins, and seems to have been killed to stop him from having chance to expose the group. Meanwhile, Thomas learns that Higgins is reluctant to use the stay in England as an opportunity to visit his father, whom he has not seen in forty years after a falling out...

Magnum is on the sea-front, watching the approaching storms brought on by the Kona Winds, when he sees a woman either slip or jump into the turbulent waters. After rescuing her, he takes her back to the estate, where she tells him that the previous night, she witnessed her husband - owner of a reel-estate empire - murder his business partner, and now fears that he'll kill her too. As Thomas investigates her husband, he begins to fall in love with the woman, but as he observes, the Kona Winds make people behave in uncharacteristic ways, and the whole situation spells big trouble and danger for him...

After thirteen years away, Thomas returns to Tidewater to attend the funeral of his beloved grandfather, Everett, and reopens a long-running family feud when he suspects his stepfather of stealing and selling a missing family heirloom -- a letter from Abraham Lincoln.

When Rick's boat returns from a cruise deserted, Magnum searches for the answers to what has happened to his friend and the passengers on-board, who are all presumed dead. His hunt is somewhat hampered by the separate investigation of a law officer who models himself on John Wayne, but as they both try to get to the bottom of the strange disappearance of the boat's passengers, they stumble upon a plot involving mobsters and two million dollars in counterfeit money...

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...

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.

Magnum's P.I. license has expired. He is tied up in red tape trying to renew it when his aunt -- best-selling, Pulitzer prize-winning playwright Phoebe Sullivan -- pays him an unexpected visit. She just finished authoring a new play and is convinced someone is trying to kill her for it. Is someone really after Aunt Phoebe, or is her mind playing tricks on her?

Thomas is delivering key evidence at the courthouse when he is shot in the parking lot by a hitman. In a coma, Thomas needs to save Michelle from some killers, and meets up with the ghost of his former Naval buddy Mac. Then he bids each of his friends a personal goodbye, in case he doesn't make it.

Thomas lies hospitalized in a coma, caught between life and death, after being shot; as his friends and family attempt to pull him out of the limbo in which he is trapped, Thomas has an out-of-body experience in which he sees himself in heaven, guided by Mac; Thomas recovers physically from the gunshot wound in time, but finds it hard to face life again; although three of the criminals who almost killed him are already dead, one is still free.

Magnum prepares for the trial of Quang Ki, who attempted to kill both him and his family. But when the case is suddenly, unexpectedly acquitted, angered Thomas suspects some other hand is behind Ki's release. It becomes evident that his arch-nemesis will stop at nothing to destroy Thomas and his family, when he receives a video-tape containing terrible information about the fate of his former wife and young daughter. As Thomas plans his revenge against Ki, he is thrust into a quagmire of intrigue endangering a sensitive P.O.W. prisoner exchange programme...

When Higgins asks his help in finding Robin's latest manuscript after it is stolen, Thomas gets some unexpected help in the case when St. Louis P.I. Luther Gillis arrives unannounced on vacation. They set about trying to work out who is so desperate to get hold of the manuscript that they are willing to resort to attempting to kill Higgins and drugging Zeus and Apollo to get it, in scenes reminiscent of those portrayed in the stolen book...

Thomas ponders his future while paying a visit to his family in Virginia, where he unexpectedly meets his grandfather and considers an offer to be reinstated to the Navy; Thomas returns to Hawaii to ascertain whether former girlfriend Linda Lee Ellison is being stalked; Rick prepares for his wedding to Cleo; Thomas and Linda renew their relationship as he searches for her stalker; Thomas becomes increasingly certain that his daughter Lily may still be alive.

As Rick's wedding looms ever closer, Thomas continues surveillance on Linda to catch the psychopathic killer who is stalking her; T.C. faces a reconciliation with his estranged wife; Thomas gets surprising news about his theory that Higgins is really Robin Masters, as well as the true fate of Lily.