When a former war friend is killed, ex Navy SEAL Thomas Magnum slips into his new life as a private investigator and is drawn into a quest for revenge and a hunt for Iraqi treasure.
Magnum assists a poor fisherman when his valuable 30-pound tuna is taken, only to learn that the thief also requires Magnum's assistance.
Magnum sets out to discover the actual identity of a man's unconscious fiancée after learning that she has had severe face surgery.
When Higgins' close friend, an art collector who hired Thomas to test his security, is killed, Magnum is arrested as the prime suspect.
TC requests that Magnum take on a case to assist in proving the innocence of the dad of one of his junior football players who is accused of murder.
An old tycoon hires Magnum to find his long-lost sweetheart, who is assumed that she died 30 years ago. On the other hand, Rick and TC assist a wounded veteran in adapting to civilian life.
As Magnum investigates the disappearance of a little girl's cat, he discovers the murder of another cat's owner, who turns to be an FBI agent.
Magnum is hired by a man dying of cancer to locate his alienated, bone-marrow-compatible brother, who also requires his assistance.
Magnum uses his past experience as a POW, when he is called in to assist a teenage kidnap victim who has escaped her kidnappers.
Magnum is called in to assist Rick's crush after her illicit poker game is stolen by masked assailants.
Higgins and Kumu's lives are jeopardized when Magnum get too involved in a case concerning a missing Russian fugitive.
Magnum, along with every other private investigator and bounty hunter, are entrusted with finding a guy suspected of murder.
Magnum assists Higgins in locating "the Viper," the assassin who murdered her true love.
Magnum investigates the killing of a guy who hired Thomas to discover his killer before his actual death.
Magnum gets abducted and finds that his ex is on the island plotting for a gold theft.
Magnum races against time when he is employed by a mother to show that her son did not murder his lover, as he only has 24 hours to do so.
Magnum pretends to be a doctor on a dating app in order to track down a killer that might be targeting rich guys.
Magnum and Higgins assist Katsumoto in looking into the death of his old mentor after the Dobermans unearth what looks to be a human bone.
After their yacht is hijacked, Magnum and Higgins are left alone at sea. They need to get to the shore before Higgins passes out and the attackers come back to kill them.
Magnum's ex-girlfriend Hannah, who is currently on the run, approaches him for assistance in locating her missing CIA father.