When the remains of a woman from a wealthy family are found in a national park, the team thinks she may be a victim of the Ghost Killer Booth's career might be in for some changes.
Nick encounters a sleazy detective and trouble.
Nick falls for a hitwoman targeting him.
Sylvie is accused of killing a police officer.
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.
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.
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.
Magnum and Higgins work a stalking case involving a man with a past in espionage Ethan asks Higgins to join him on an extended trip for Doctors Without Borders just as Magnum starts to open up to other possibilities.
Magnum's uncle visits and reveals a shocking secret about Thomas' mother TC asks Higgins for help when he realizes he may have witnessed a potential murder from his helicopter Higgins decides it's time to tell Ethan the truth about her past.
A psychic hires Magnum and Higgins to prevent a murder she claims to have foreseen Katsumoto questions Kumu when her information is found on recovered stolen jewels that once belonged to the infamous Imelda Marcos.
As Magnum and Higgins work a case to recover valuable stolen truffles, they also must care for a baby left abandoned at the gates of their estate Kumu tries to locate the infant's mother.
When a Marine Corps vet's SUV is stolen with her service dog inside, Magnum and Higgins must find the car, the dog and the car thief who they believe may be an escaped kidnapping victim.
When a married woman asks Magnum and Higgins to find her lover's killer because she doesn't want to expose the affair to the police, they find the victim wasn't who he claimed to be Rick visits Icepick, whose health has taken a turn for the worse.
When an Army Ranger goes missing after returning from deployment, Magnum learns of the traumatic news he received upon arriving home and must find him before survivor's guilt consumes him.
Nick and Sylvie must find a stolen heart intended for a transplant operation.
A psychic helps Nick solve a wine critic's murder, which she predicted.
A New Orleans kidnapping case develops into more.
Probing a fertility clinic, Nick uncovers a scam targeting women desperate to become pregnant.
The team investigates the murder of a professional informant after he's found dead outside an abandoned factory Maggie reconnects with an old colleague and mentor.
After a mysterious bioweapon leaves two MTA workers dead and one injured, the team rushes to determine who is behind the attack and the location of their next target Jubal's past demons begin to surface.