The mother of a suspected bomber hires Magnum and Higgins to locate her teen son and turn him in to the authorities. Also, Kumu and Rick help T.C. navigate his guilty conscience when he runs into a past flame.

Magnum and Higgins search for a CEO who has mysteriously vanished. Rick braces for a visit from his wild-child little sister, Ruthie.

Magnum and Rick race to find a missing witness who can exonerate an innocent man accused of murder. TC tries to repair his relationship with Mahina after being released from the VA.

Magnum and Higgins agree to help a teenage Amish boy who has traveled to Hawaii in search of his runaway sister. Rick sets out to find TC a date to the Marine Corps Ball.

Magnum and Higgins re-examine a fatal arson investigation at the request of TC and Mahina, leading to a sinister discovery. Kumu volunteers with Rick at a veterans’ crisis call center.

Magnum and Higgins take a major step forward in their relationship. At the same time, the past comes back to haunt them when a previous suspect becomes their client. TC aims to scale up Island Hoppers. Rick gets a new business partner.