ION Mystery

A human skeleton is found in the trenches of a Civil War battleground; Booth's brother returns from his trip with surprising news.

Brennan and Booth investigate a set of uniquely disfigured remains allegorizing biblical text; a Jeffersonian intern reveals a secret about his past.

The team reopens a cold case when a stolen Navy-issue gun turns out to belong to a chief petty officer who died 40 years ago; the team makes their annual Thanksgiving dinner together.

A retired SEAL -- who tracked people impersonating military personnel -- is murdered; Brody finds that LaSalle is uncharacteristically unenthusiastic about Christmas.

The investigation into an explosion at the Navy-Marine Corp Relief Gala reveals Pride was the bomb's target.

The NCIS team and the Coast Guard Investigative Service work together when a Navy Admiral's daughter is the prime suspect in a double murder on a research boat; Lasalle looks for his estranged brother.

After learning he was poisoned with a deadly dose of radiation, a Navy lieutenant commander asks Pride and the team to solve his imminent murder.

An agent is killed while working on a security detail for the Vice Chief of Naval Operations; Brody's past is evaluated.

A petty officer is murdered during Mardi Gras festivities; Pride contemplates what to tell his daughter about his strained relationship with his father.

The NCIS team tries to narrow down the motive when a Navy recruiter is murdered in a hit-and-run; Lasalle worries about his brother.

McGarrett works the murder case of one of the last survivors of the USS Arizona; Adam uncovers bone fragments at his new construction job.

Danny protects a coma patient who was the key witness from his last case at the Hawaiian Police Department.

McGarrett gets a tip that someone is plotting a terror attack on Oahu; Chin and Abby face a difficult decision.

McGarrett risks his life when Five-0 attempts to rescue the young girls trapped in the sex trafficking ring they have been tracking; Kono makes a life-changing decision.

McGarrett and Danny recruit Tani Rey to join the task force when a hacker releases a dangerous arsonist from prison.

McGarrett and the team work with an injured police dog that is the only witness to an ambushed drug bust; a former SEAL looks to join the task force.

The team enlists an old friend when a crime boss is murdered, triggering revenge killings across the island; MacGarrett and Danny work out details concerning their new restaurant venture.

When the HPD system is hacked and one of the Five-0's informants ends up dead, McGarrett enlists the help of hacker Aaron Wright, whom he just imprisoned.

At Halloween, the team investigates a string of murders that mirrors stories from well-known Hawaiian folklore; Grover visits a man who is hours away from execution and may hold the key to a case that has plagued Grover for years.