S4, EP9 "Better Watch Out"
A Christmas Eve ransomware attack on the Honolulu Police Department forces Lia to reveal a family secret to Magnum and Katsumoto.
S4, EP8 "A Fire in the Ashes"
Magnum starts following Higgins to discover what she's been hiding, as she's secretly assigned to infiltrate a group threatening to take down MI-6; Rick struggles after an explosion takes the life of someone important to him.
S4, EP7 "A New Lease on Death"
When Rick is asked to assist with a federal investigation of his childhood friend Robbie, Magnum launches his own investigation to see what the federal agents really have on him; Kumu goes under cover in a retirement community.
S4, EP6 "Devil on the Doorstep"
A journalist hires Magnum to track down his anonymous source after they mysteriously go dark; Higgins receives a new assignment from MI-6; Rick's old friend comes to the island, but TC is suspicious of his motives.
S4, EP5 "Til Death"
Magnum and Higgins are hired by an anxious groom to look into his bride-to-be on the eve of their wedding; TC makes a touching decision on how to help Cade.