The ninth season of Hawaii Five-0 finds McGarrett (Alex O'Loughlin), Danny (Scott Caan) and the Five-0 task force continuing to wipe out the crime that washes up on the islands' sun-drenched beaches. This season, McGarrett must endure sensory deprivation torture to find a friend's killer, track down a dirty CIA agent with a complicated history with Steve, determine if Adam did in fact kill his crime-boss sister, battle a crime wave during a heat wave, and plan to open a very bro-mantic restaurant, all the while protecting Five-0's loved ones and Hawaii's citizens and visitors of the 50th state.