Magnum 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, Magnum gets some unexpected help in the case when St. Louis gumshoe Luther H. 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.