T.C.'s children, Melody and Bryant, come to visit him in Hawaii, but at the airport Melody goes missing. It transpires that the young girl has been kidnapped, and is held for $300,000 ransom. Magnum, Rick and Higgins help in the rush to either raise the ransom money in time, or deduct and find whoever snatched Melody. The kidnapping puts a strain on T.C.'s relationship with his son Bryant, as well as his ex-wife Tina, who quickly comes to Hawaii with her new boyfriend as soon as she hears of the kidnapping of her daughter...

Thomas is trying to get Rick, T.C. and Higgins interested in joining him in a potentially lucrative new tourist business venture. But his friends all have other things on their minds, especially T.C., who puts thoughts of the deal on the back-burner when his son Bryant lands in trouble with the Police after becoming mixed up with a juvenile biker gang...

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...

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.