Magnum has been hired by a woman to act out some of her rich, bored sister's fantasy dramas, concocted from 1930s Dashiell Hammett films. Although growing to enjoy the world of fantasy, Magnum has a hard time keeping up with the eccentric woman, and when he finds out that her husband is a wealthy, infamously jealous and bad-tempered business man, he decides to cut his losses and end the arrangement.

The code of the West is resurrected when a hot-headed young Texan hires Magnum to find his former cheerleader sister.

Magnum plays Cupid's helper when he becomes involved with a former Russian pilot who has defected and a member of the Soviet track team in Hawaii for an exhibition match, plus various members of the dreaded KGB.

Conned by an old friend, Magnum and TC agree to deliver a set of encyclopedias, not knowing that the knowledge contained within is a large marijuana drop.

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