Goldie Morris, an old friend from his high school days, needs Magnum's help to track down a stolen dolphin, a dolphin that has been loaded with explosives!

Magnum decides to get a "real job" and takes on the challenge of being the house detective for a Waikiki hotel, but finds his boss all too Higgins-like and is tasked with apprehending an elusive thief before an upcoming jewelry convention to be held at the hotel.