Higgins is preparing for a prestigious chess tournament, and the arrival of an important visiting dignitary, the President of Costa Del Rosa, who will be attending it. There have been threats made on the President's life, and Magnum is asked to apprehend those responsible. But both Magnum and Higgins have even more to contend with when yet another of Higgins' illegitimate half-brothers, the flamboyant Don Luis Mongueo, the last of the royal line of Costa Del Rosa, makes an appearance on the scene. But with the plots to assassinate the President, Don Luis emerges as the prime suspect...
Cast of Magnum, P.I.
Tom SelleckThomas Magnum
John HillermanJonathan Higgins
Roger E. MosleyTerry "TC" Calvin
Larry ManettiRick Wright
Gillian DobbAgatha Chumley
Sharon StoneDiane Dupres / Deirdre Dupres
Denny MillerLeon Platt
June ChadwickEnglish Flight Attendant
Carolyn SeymourElizabeth, Lady Ashley
Margie ImpertMadeline Jones
Ernest BorgnineEarl Gianelli / 'Mr. White Death'
Hari RhodesPrison Guard
Glenn CannonDr. Ibold
Ed LauterCaptain Quintin