Magnum seems to be lost between reality and fantasy, past and present, when he is convinced that he has seen an old friend, Mac, very much alive, walking the streets of Honolulu.
Magnum is working on a case for assistant D.A. Carol and is forced to face a difficult dilemma concerning the guilt of innocence of the suspected murdered who is guilty of another crime.
Magnum is very enthusiastic about his new project, teaching a class at the University about private investigation. The class is small but interest is great about everyone helps a student investigate the strange behavior of her fiancé.
While Magnum is preoccupied with a very difficult case, help arrives just in time in the person of Luther Gillis, the hard-nosed private eye from St. Louis.
Magnum is displaced from the guest house when an overly imaginative novelist, who suffers from a sever case of writer's block, becomes suspiciously interested and involved in his latest case.
A very attractive security expert brings out the romantic in Magnum when she is hired to help protect Robin's Nest during a jewelry exhibit worth millions of dollars.
Higgins is very pleased with the prospect of his distant cousin's arrival. She is to marry the heir of an old Hawaiian family but turns out to be a true punk rocker.
Magnum investigates a case which involves his friend Carol who works for the D.A. and who is about to testify against a man sent to prison by her father while Higgins struggles with the truth during a visit of former Sandhurst friends.
While in Cambodia on a rescue mission of an old Army buddy, Magnum, Higgins, Rick and TC realize that their lives are on the line because of great danger and deceit.
Lacy Fletcher seeks Magnum's help to unearth five songs which has been written by the legendary George Lee Jessup for the woman he loves before he died 25 years ago.
After Magnum has just been put through the wringer at the Hall of Records, he is very reluctant but finally agrees to help one of the clerks, a woman named Ms. Jones, who is looking for her missing husband.
