ION Mystery

On Halloween, the team investigates the murder of a medium who was apparently frightened to death by a poltergeist; a mysterious death cult kidnaps Kono and Adam.

Catherine informs Five-0 that McGarrett's mother has been captured and is in danger of being executed for trying to free Wo Fat's imprisoned father; Chin is unable to delay Sara's adoption.

While Danny chaperones Grace's high school dance, the venue is seized by terrorists, who hold everyone hostage with the intent of abducting a diplomat's son; Danny and Grover discover that Will is Grace's secret boyfriend.

A conspiracy theorist with compelling information that JFK's own cabinet planned his assassination is murdered.

A boy suffering from PTSD undergoes hypnosis and realizes he may have witnessed a murder related to a 10-year-old cold case; Danny's sister visits Oahu.

The team rushes to Mexico, where Chin puts his life in jeopardy in an effort to rescue Sara, his kidnapped niece.

When Chin is kidnapped by a Mexican cartel, Five-0 must rescue him before he is executed by the vengeful group; Grover goes under cover to investigate a murder, which turns out to be far more complex and dangerous than anticipated.

While Max prepares to say his goodbyes, the team investigates a murder during a police convention on the island.

The team faces a contentious U.S. Marshall after a murder suspect escapes capture and looks for asylum in the sovereign land that belongs to the Nation of Hawaii.