Captain Grover is aided by McGarrett in his search for a friend who has disappeared, after it seems like he's committed murder. Kono persists in her quest to find Adam.
A serial killer at the heart of Five-0's investigation puts Chin's life in danger. While on the shores of Oahu, Danny and Grace come upon an odd puzzle box.
When someone tries to kill a Pearl Harbor veteran, Five-0 links evidence to a crime committed within the internment camps on Oahu during World War II.
Five-0 is tasked with babysitting Mary's newly adopted baby, even as they investigate the murder of an undercover ATF agent.
Five-0 is assigned by the CIA to find a missing federal prisoner after the plane he is being transported to Oahu on arrives without him, but instead has four dead bodies. After being set up for a murder, Kono finds herself on the outs again with the police force. Steve has another surprising encounter with Wo Fat. Danny reconnects with Gabrielle.moreless
Things turn dangerous for a talk show host and her crew following Five-0 around when they run into Wo Fat.
Five-0 must determine who killed a member of a local company that is bringing sharks in closer to shore. Steve assists Kamekona in getting his helicopter license and this becomes a hot topic of discussion.moreless
The daughter of a murdered Lua master comes to Hawaii Five-0 for help. Steve decides to have a private investigator keep tabs on his mother.
A man who was injured years ago begins taking revenge on the police officers who caused his injuries, including Steve whose father was one of the officers responsible for his maiming.
The team is directed to investigate when a prostitute is murdered in a Congressman's home, who is nowhere to be found. Danny has his own drama as the custody hearing regarding Grace goes to court.moreless
Chin is kidnapped and taken to the Halawa Prison, where he is dressed as an inmate. He must find a way out before his identity is revealed.
While Danny gets assigned to protect a Victoria's Secret model, Max and Sabrina find themselves in danger when a bank robbery goes awry.
Steve attempts to arrange a reunion between his mother and sister. When a young computer hacker is murdered Hawaii Five-0 steps in.
Halloween has Five-0 investigating a ritualistic murder, with evidence the killer will strike again.
Steve's attention is divided between their current investigation into a Polo players murder and the return of his mother.
Steve and Danny take some time off to enjoy a little fishing only to find themselves stranded and facing pirates.
Steve goes to Cat for help finding his mother. When an art heist turns deadly, Five-0 turns to August March.
Hawaii Five-0 needs help when they encounter a terrorist who states that he has a deadly virus and will release if his demands are not met. The NCIS counter terrorism team stationed in Los Angeles sends over two of its agents to assist the HPD.moreless
Max reveals some revealing information about his childhood in order to convince Five-0 that a serial killer is on the loose.
A crooked cop who is seeking revenge against Danny decides to visit the island, putting Danny and his family in jeopardy.
A professional hit on a teenager has Five-0 searching for the reason why in order to determine who killed her.
The investigation into a plane crash and a dead custom agent leads Five-0 to question if the victim was alive before takeoff. Danny finds himself taking in an abandoned dog.
As the Five-0 team investigates a young couple killed while filming a documentary, Danny finds himself placed under a curse by a transient at the killing site.
When a local deep sea diver is murdered, Five-0 heads out into the ocean to find the killer.
When a Navy SEAL turns up dead, Joe asks McGarrett to take a second look at his death. Kono is spending time with a group of ex-cops that were rumored to be dirty, much to Chin's disappointment.moreless
As McGarrett and his team close in, criminal mastermind Wo Fat retaliates against Five-0. And without the Governor backing them up, McGarrett's showdown with Wo Fat could mean the end of Five-0.
A renowned photographer has been murdered and Danny thinks this case may be the best one yet when he has to talk with the models in town for a sports magazine's annual swimsuit cover shoot.moreless