The former wife of infamous adventure author and thrill-seeker ""Mad Buck"" Gibson, hires Magnum to protect her ex-husband, who, despite being in later life, continues to live his life to the full as a hell-raiser. With Buck to stay as a guest of Robin Master's on the Estate, she wants Thomas to keep him out of danger until she has collected the back alimony money he owes, but he may not be around to pay it if he keeps on with his dangerous antics - something which is proven when Buck makes his entrance onto the scene in a dare-devil parachute stunt - injuring Higgins in the process! Thomas has his work cut out for him trying to ensure that the ageing adventure-seeker, determined not to let age get the better of him, doesn't come to any harm with his wild adventures, but as he does so, he discovers that the man is harbouring a worrying secret, and is seemingly set on a course of self destruction...

De auteur Buck Gibson komt op bezoek. Joan, één van zijn ex-vrouwen, huurt Magnum in om Buck in de gaten te houden, om er zeker van te zijn dat hij alimentatie zal betalen.

Joan Gibson, ex moglie del romanziere e testa calda 'Mad' Buck Gibson, assume Magnum per proteggere il suo ex marito da se stesso, poichè nonostante la sua età continua a comportarsi come un ragazzino in cerca di un rush di adrenalina. Ospite del Nido di Robin Masters, Mad Gibson tiene Thomas molto impegnato, ma durante il suo impiego come 'guardiano', Magnum scopre che Buck nasconde un oscuro segreto che lo sta logorando e che il suo atteggiamento spericolato è dovuto a un desiderio di autodistruzione.

Haudegen Mad Buck Gibson will seine Freunde in Hawaii besuchen. Nach einem halsbrecherischen Auftritt mit dem Fallschirm landet er direkt auf Higgins. Täter und Opfer werden ins Krankenhaus gebracht, während sich Gibsons Exfrau um die Fortzahlung der Alimente sorgt.

Mad Buck Gibson (un vieil ami de Robin Masters et une légende à lui tout seul pour ses romans vulgaires et son existence de macho), arrive à Hawaï. Engagé par sa femme Joan, Magnum aura pour tâche de protéger ce terrible bonhomme de lui-même...

Bláznivý a odvážný spisovatel Buck Gibson chce navštívit své přátele na Havaji netradičním způsobem. Po šíleném seskoku padákem přistane přímo na Higginsovi. Oba jsou okamžitě odvezeni do nemocnice. Mezitím si Joan, jedna z Gibsových bývalých manželek, najme Magnuma, aby na něj dohlédl, neboť je riziko zmizení jejich "alimentů".