An eccentric, reclusive inventor, a beautiful author and a distraught senator's wife form the strange triangle surrounding Magnum as he tries to unravel a situation that could lead to sudden death.

Magnum does not count on murder when he chaperones Rick's convent-school sister on a night on the town.

A reluctant Magnum agrees to help a friend of Higgins to find the person or persons responsible for the kidnapping of his grandchild.

As Rick's wedding looms ever closer, Magnum continues his surveillance on Linda to try and catch the psychopathic killer who is stalking her. T.C. faces a reconciliation with his estranged wife. And Magnum gets some surprising news about his theory that Higgins is really Robin Masters, as well as the true fate of Lily.