Higgins meets an English duchess who he was enamored with over the years.
While Magnum prepares for an annual sea-surf race, Higgins has his hands full hiding the beautiful Lady Wilkerson from two shady pursuers. Smitten by the lady in distress, Higgins sends her a letter expressing his feelings, but she mistakenly thinks the amorous words are from Magnum. It quickly becomes a case of romance on the run when the duchess is kidnapped and the two "Romeos" must spring into action to save her.
- Tom Selleck as Thomas Sullivan Magnum IV
- John Hillerman as Jonathan Quayle Higgins III
- Roger E. Mosley as Theodore "T.C." Calvin
- Larry Manetti as Rick Wright