One night, Rick, feeling down after learning that a girl he was serious about is getting married, meets an attractive young woman called Sara, a beautiful woman dressed in a white vale. As the pair befriend each other, she tells him that she is being terrorised by a man named Henry Ellison, after she didn't return his feelings of love. But during a walk on the beach with the girl, she suddenly disappears, seemingly into thin air. Rick insists that Thomas look in to it, and they learn that Sara died 35 years ago, after supposedly committing suicide, though there was rumour that suggested she was murdered; and sightings of her ghost are occasionally reported. Magnum digs into both the past and present to find if there is logical explanation and if someone is impersonating Sara, or if it really was something more ethereal that Rick encountered..

A year after escaping from Moscow in a Mig-30 jet, a Soviet defector hires Magnum to help his girlfriend defect from an Olympic track team visiting Hawaii. She is under close watch of undercover K.G.B. agents, and Magnum, T.C., and Rick, with assistance from Higgins, must carry out their plan with Military precision to free her...

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...

Thomas awakes from a bad car accident in which he drove the Ferrari over a cliff on his way home from dinner with his clients, for whom he was searching for a missing young woman; the accident leaves him with amnesia, and as he struggles to remember the events that lead up to the crash, he becomes the prime suspect when the girl he was looking for is found murdered, and one of his baseball caps is found at the scene of the crime.

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...

When a highly eccentric, practical joke-loving and not very well liked millionaire Wilson MacLeish is killed when his new bi-plane explodes, Thomas, who had been working on a case for him, is summonsed to the reading of the will. Read out via a video-tape, the deceased millionaire leaves his ex-manservants some money, but leaves his relatives practically nothing, instead leaving his estate and wealth – fifty million dollars - to Thomas! MacLeish's relations are put out and angered by this, and Thomas takes up his new residence on the estate. On a second video-tape, MacLeish informs Thomas that before his death he had suspected that one of his relations is trying to kill him for his inheritance, and wants Thomas find out who. But it begins to seem that whoever may have been responsible for the millionaire's death is now trying to bump Magnum off too...