A joyous reunion between Hanna and her mother is cut short when "A" sets sights on a new target. And Toby uncovers some surprising information about Wren.
Magnum and Higgins take on a dangerous mission inside a high-security correctional center when a ruthless criminal abducts Katsumoto's ex-wife, Beth. Also, T.C. rushes to help Rick when Suzy has unexpected pregnancy complications.
A Christmas Eve ransomware attack on the Honolulu Police Department forces Lia (Chantal Thuy) to reveal a family secret to Magnum and Katsumoto.
A disoriented man hires Magnum and Higgins to investigate a crime he doesn't remember after he woke up on the beach covered in blood.
While Magnum and Higgins reunite and work the case of a construction worker's tragic death, TC and Shammy get skyjacked by a pair of drug runners posing as tourists.