Rick is organising a surf-ski competition to be held at the King Kamehameha Club (much to the disapproval of co-committee member Higgins) when a Kahuna appears a places a ""curse"" on the club and all who use it. Magnum and others are sceptical, but the native locals take such curses very seriously, and it seems there may be something in it when one of the competition competitors suddenly collapses and dies; then, amongst other incidents, fire breaks out in the kitchen; and when Rick falls ill. Thomas investigates to try and find if there is a more logical explanation behind the events, but his enquiries aren't helped by a hounding news reporter, who sees the series of strange incidents as a chance for a big news story...

Having once been hired by wealthy, blind Agatha Kimball to find her missing grand-daughter Amy, Magnum's services are once again called upon by his elderly friend after she has been contacted by a black-mailer claiming to have some important information about Amy. She instructs Magnum to pay the man and get rid of whatever the information about Amy is without investigating further, but when Agatha is nearly killed in a series of suspicious accidents, and when the black-mailer is shot dead during the delivery of the ransom, Thomas decides he must ignore instructions and investigate just what trouble his elderly friend and her grand-daughter are in...

Magnum tries to impress a beautiful ""fan"" of Robin's that he befriends, by showing her the Robin Masters estate, only to learn that she is actually a top security expect hired by Robin to test the estate's security. The security company she works for has been hired after Robin's life is threatened if he publishes his latest manuscript; and with him heading for one of three possible locations to collect some dictation tapes, she asks Magnum's co-operation in seeing that the estate is on top security in case it is the destination he's heading for. With the additional aid of T.C. and Rick, Robin's Nest is soon turned into a heavily guarded fortress, but there are parties out trying to see that Robin never makes it to his destination...

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...

Magnum is hired by an old friend's Japanese wife when her now wealthy husband is kidnapped and held for $500,000 ransom. She wants Thomas to deliver the ransom without her strict father, who has never approved of the marriage, finding out. But the further he gets involved, Thomas more and more comes to suspect that not all about the kidnapping is as it seems...