Captain Grover must steal $100 million dollars in order to get back his kidnapped daughter.
Steve and Catherine journey to Afghanistan to help a young boy whose family is responsible for saving Catherine's life many years ago.
After following up on a tip, Steve and Danny are trapped inside an abandoned building that is rigged to explode.
Five-0 investigates three murders that appear related to a downed top-secret Chinese satellite. Captain Grover lets Clara accompany him on a ride-along.
Abbie and Ichabod must find a way to save Abbie's sister, Jenny, who has been possessed by an evil spirit.
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.
While attempting to communicate with Katrina in Purgatory, Ichabod and Henry Parrish unwittingly unleash a new evil.
A Colonial house from Ichabod's era may hold they key to finding a missing person... and a secret from Ichabod's past.
With the President on the way to Oahu, Five-0 is tasked with the murder investigation of a secret service agent. Steve's Aunt Deb comes for a visit along with an eye opening secret.moreless
Jenny returns to Sleepy Hollow to help Ichabod, Abbie, and Captain Irving against the Horseman, only to realize his true motive wasn't what they believed.
With national security in mind and at the behest of the Governor, McGarrett and Captain Grover set out to serve a warrant on a young computer hacker.
As Ichabod and Abbie deal with the Horseman as it seeks its skull, Abbie gets an unexpected visit from Andy Brooks.
Five-0 is tasked with babysitting Mary's newly adopted baby, even as they investigate the murder of an undercover ATF agent.
Ichabod disappears and Katrina contacts Abbie in her dreams to warn her that the Headless Horseman is returning, and that she should seek out a reclusive man, John Parrish. Meanwhile, Ichabod encounters a figure from his past.moreless
Halloween and a shooting have Hawaii Five-0 looking for a man carrying out experiments and turning humans into zombie-like creatures.
Catherine's surveillance job turns deadly. In order to save Kono, Adam reflects on what his best move should be.