The young daughter of a Navy SEAL in Afghanistan is kidnapped, but Five-0 soon discovers that the kidnappers took the wrong girl and are negotiating with the wrong family.
Three surfers get more than they bargained for when they rob a tour bus, Jerry continues his investigation of a counterfeiter, and Danny searches for his brother's missing money.
Five-0 deals with a mob contract killer who has literally and figuratively had a change of heart. Danny finds his brother's money but is short five and a half million dollars, and his brother's life may be in the balance.
McGarrett meets an old acquaintance of his father's at his gravesite, which prompts him to investigate an old case his father was working on just before his death.
Wo Fat kidnaps McGarrett to get answers about his father. He drugs McGarrett during his interrogation, which causes him to have hallucinations that his father is still alive.
A man who conned people with bad investments is murdered along with his wife, and their children are suspects. Meanwhile, McGarrett's Aunt Deb returns to Hawaii with surprise news.
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.
