With the help of an ex-HPD officer-turned private detective, Five-0 tries to solve the homicide of a woman who was working for a hula dancing company that is actually a front for an escort service.
Five-0 runs into problems as they try to capture an international art thief who stole a priceless Van Gogh painting, and Kamekona gets help from an "Iron Chef" to win a shrimp cook-off.
The murder of a surgeon leads Five-0 to a 40-year-old mystery involving four boys who disappeared from a reform school. Meanwhile, McGarrett tries to find out who stole his prized car.
Kono must fight for her life after discovering a notorious criminals identity; Adam's ties to his formerly corrupt family business leaves Kono feeling concerned.
After investigating the death of an investigative journalist, Five-0 discovers that a violent Congolese warlord who was reportedly killed is actually living in Honolulu.
Five-0 works with a California ATF agent to locate a serial arsonist targeting couples on Oahu. Danny and Amber's romantic getaway is ruined when her abusive ex-husband tracks them down.
Danny and Chin Ho are arrested for the roles in the death of Marco Reyes, the Colombian drug lord who killed Danny's brother. But with the help of Joe White, McGarrett discovers that there's more to their arrests than meets the eye.
McGarrett and Odell come under siege in Odell's barbershop when they try to protect a man who is being hunted by a gang. Meanwhile, Jerry is wrongfully accused of committing a series of home invasions.
Grover's closest friend's wife is killed on their anniversary trip to Hawaii, but Grover suspects that he may have killed her. Meanwhile, Danny is stuck in an elevator with a dead body and a medical examiner.
Three middle-aged accountants find a dead body in their hotel room after a night of Spring Break partying. Meanwhile, Jerry stumbles on a murder involving a possible sex slave trafficking ring while making a delivery for Kamekona.
While Chin Ho faces an old nemesis when Five-0 tracks down a meth ring associated with a murder, Kono is lost at sea during a solo journey after a violent storm.
While Five-0 investigates the murder of a bounty hunter after he apprehended a fugitive hiding out in Hawaii, Rachel reveals a long-held secret to Danny that has serious ramifications.
A murder mystery sends Five-0 in search of pirate treasure. Meanwhile, Gabriel Waincroft holds Kono and Adam hostage after their wedding and demands the money they were using to pay off the Yakuza.
Five-0 needs the help of an imprisoned bomber to find a copycat on the loose, but is he somehow related to the crime? Meanwhile, Kono and Adam discover that they're being watched after Adam recovers from the shooting.
While the team tries to track down the owner of a gun found in the ocean that was responsible for two deaths, McGarrett and Catherine reach a crossroads in their relationship.
Five-0 investigates when a wealthy recluse is found dead in a remote field with nearly one million dollars in counterfeit bills. Also, Adam is kidnapped by the Yakuza and forced to torture one of Gabriel's men. Jerry Rice guest stars.
Five-0 interrogates members of a stunt biker gang to locate a killer who escaped by jumping his motorcycle from one rooftop to another. Meanwhile, the riders prepare to race in a Tough Mudder competition.
Five-0 is in search of a serial killer who may be a modern-day Dr. Frankenstein, while also dealing with a hostage situation after a blood bank robbery. Meanwhile, Danny is frustrated after Grace goes to a Halloween party behind his back.
While snorkeling off a deserted island McGarrett and his new girlfriend stumble onto the hideout of a wanted gangster while Chin, Kono and Grover must track down a gambler who is forcing a high school quarterback to throw a playoff game.
Five-0 works with a conman to find a killer after his partner is murdered. A San Francisco police inspector helps Chin Ho investigate the murder of Chinese arms dealers. Adam receives some unsettling news after meeting with the Yakuza boss.
After a college professor is murdered, Danny goes undercover as his replacement and Eric poses a college student. McGarrett gives advice to a young man after his dad returns from jail and wants to get back in his life.
The brother of a local boxer is killed the night before his championship bout, and Five-0 connects it to Gabriel Waincroft, who has an even bigger target in mind. Meanwhile, Adam takes a plea and prepares to serve his sentence.