Magnum becomes the obsession and medium for a crazed killer who works though nursery rhymes.

Magnum works with Michael Doheny, a retired policeman, who is searching for the man who murdered his granddaughter.

Magnum investigates the death of a close friend, a lieutenant who may have been involved in illicit activities.

While visiting his family in Virginia, Magnum receives an alarming phone call which sends him back to Hawaii to find romance, suspense and danger in a special two-hour finale.

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.