Susan Johnson (played by Carol Burnett) is a bank teller who, desperate to hire Magnum, locks the two of them in a time-released bank vault.

Magnum is caught between danger and intrigue as a frightened lady, who believes her life is in danger, involves him in a bizarre situation.

Magnum finds himself torn between twin sisters as his involvement with one brings him into conflict with the other.

Magnum tries to help a young Amerasian boy find his long lost G.I. father and ends up in the middle of political corruption and mob intrigue.