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.
The team jumps into action when analyst Kelly Moran is taken hostage.
When a wealthy accountant is gunned down for secretly testifying against a notorious drug lord, the team's investigation leads Tiffany to ask for help from a friend who was formerly with the NYPD and is related to the dangerous crime boss.
The team investigates a series of brutal assaults OA hides information about his own mugging.
As the team investigates a deadly robbery, it discovers one of the perpetrators is a classmate of Jubal's son.
When an officer is shot dead at a pawn shop along with the store's owner, the team tries to figure out why a young, recent Ivy League dropout is tied to the crime.
The team pivots when their sting operation to secure a massive bomb from an illegal broker leads them to discover that the device is already in the wrong hands Jubal's promise to be present at his son's birthday party is put to the test.
When a retired Drug Enforcement Administration agent is shot outside a bakery, the team works to determine if the victim's past cases or current bouncer job are connected to the murder Nina and Tiffany clash over the use of an informant.