McGarrett refuses to listen to Danny's pleas to take it easy while recovering from surgery; Five-0 goes on the hunt for a serial killer as fear grows that it's not safe to travel to Hawaii.
Five-0 must work with rogue MI-6 agent Harry Langford to find a terrorist planning to cause nuclear reactors across Europe to meltdown. Also, McGarrett and Danny ask retired FBI profiler Alicia Brown to help them find their serial killer vigilante.
FBI profiler Alicia Brown is forced to join McGarrett in the hunt for the chess-piece killer when she finds a body in her bed. Meanwhile, Kono reconnects with a former surfing competitor who is now a disabled and homeless war veteran.
Five-0 must find McGarrett and Alicia when they are kidnapped by the serial killer they've been hunting.
When a cache of guns is stolen from a gun range, Five-0 discovers the culprit is intent on making a dramatic statement on gun violence.
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