Season 4

Steve McGarrett, a decorated Naval officer, returns to Hawaii to investigate his father's murder and is asked to head up an elite police task force.

The team must quickly find an abducted NSA cyber-terrorism expert before a national security breach occurs.

An escalating gang war reaches the stands of a high school football game and several people are caught in the crossfire; an unlikely alliance forms.

A dangerous convict escapes from an island prison to search for his stolen money; McGarrett's sister arrives from the mainland.

A US ambassador's daughter is found dead, and the team are tasked by the governor with locating her abductor.

A successful surf company's CEO is murdered, and Kono revisits her past. Meanwhile, the team dive into the world of North Shore surfing.