Danny protects a coma patient showing signs of waking who was the key witness from his last HPD case before he met Steve and joined Five-0.
McGarrett investigates the murder of one of the last survivors of the USS Arizona and learns about his grandfather's important role at Pearl Harbor. Meanwhile, Adam uncovers bone fragments at his new construction job and asks Jerry to help him discover the truth of what happened.moreless
McGarrett and Five-0 are captured and face certain death after tracking a dangerous nemesis to the Island of Lanai. Meanwhile, Grover takes his son to Chicago where he testifies against a dirty cop from his past.moreless
Five-0 helps a close friend work the case of a kidnapped wealthy woman whose husband may have something to hide. Meanwhile, Rachel tells Danny that she is getting a divorce from Stan.
A conspiracy theorist with compelling evidence that JFK's cabinet ordered his assassination is murdered. Five-0 investigates and delves into one of history's most fascinating unsolved mysteries.
Danny chaperones Grace's winter formal but terrorists seize the venue and hold everyone hostage in order to kidnap a diplomat's son. Also, Danny and Grover are shocked to learn that Will is Grace's secret boyfriend.moreless
McGarrett and Alicia are kidnapped by the serial killer who has been terrorizing the island after they discover his identity.
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.moreless
Five-0 works with rogue MI-6 agent Harry Langford to find a terrorist planning to cause nuclear reactors across Europe to melt down. Meanwhile, McGarrett and Danny ask retired FBI profiler Alicia Brown to help them find a serial killer vigilante.moreless
Season 7 begins with the body of a serial killer being found in Five-0 headquarters with an ivory chess piece in his mouth. When a second serial killer is found dead with another chess piece, Five-0 hunts for the vigilante as fear spreads that it's not safe to travel to Hawaii. Meanwhile, McGarrett refuses to take it easy, even though he is recovering from surgery.moreless