A Robin Masters' sponsored jewelry design competition is being held at the estate with over $170 million worth of jewelry on display and the insurance company sends Krista Villeroch to check on the estate's security.
Higgins' cousin Sally arrives in Hawaii to get married and Higgins has a big surprise. Meanwhile, Magnum is helping Agatha recover $10,000 from a bankrupt investment.
Someone is harassing Assistant District Attorney Carol Baldwin and Magnum agrees to help her. Higgins is facing a reunion with his old Sandhurst classmates.
Magnum and Higgins are captured along with Tyler. Rick and TC rescue Magnum and the others, and a gun fight ensues. Freedom wins and everyone returns home.
Magnum and Higgins go to England to prepare Robin Masters' latest purchase, a castle, for a party. While there, Magnum looks up an old friend only to learn he is dead.
When he takes a job as a hotel detective, Magnum's attempts at catching a cat burglar preying upon guests are complicated by his relationship with a hooker who keeps getting him into trouble with both criminals and his boss.
Magnum goes home to Virginia to attend his grandfather's funeral. And when a family heirloom goes missing he accuses his step father of stealing it to save his business.
Robin Masters' publisher buries a chest containing $1 million on Oahu and a contest is held to find it. Magnum is tasked with protecting the woman who has the clues to the chest's whereabouts.