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.
The daughter of a macadamia nut tycoon is murdered during Chin's high-school reunion. The investigation reveals that the victim was killed with a stiletto heel.
The team investigate when the body of a real estate agent is found buried at one of his listings. Danny's mother unexpectedly comes to town with some extremely startling news.
An escaped convict out to prove his innocence kidnaps Steve and Danny. Grace punches out another student at school.
The two worlds collide as Sleepy Hollow is rocked to its core in the final battle between Good and Evil.
The murder of Chin’s father, 15 years ago becomes the focus of Internal Affairs and there are questions regarding Malia’s relationship with Chin and its impact on the prior investigation.
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.
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.