Ep 1. Hai'ole (Unbreakable)

The second season of Hawaii Five-0 starts off with the episode "Hai'ole" which means "Unbreakable" in Hawaiian. The episode begins with a dramatic car chase through the streets of Honolulu as Steve McGarrett (Alex O'Loughlin) and his team pursue a group of thieves who have just robbed a local jewelry store. The pursuit ends when the suspects' car crashes and explodes, killing them all.

Later, as McGarrett and his team investigate the jewelry store robbery, they discover that the thieves were after a rare set of antique medals from the American Civil War that are worth millions of dollars. The medals were owned by a wealthy businessman named Robert Coughlin (Treat Williams) who had recently died and left them to his daughter, Jennifer (Larisa Oleynik). McGarrett and his team suspect that Coughlin's death may have been related to the theft of the medals.

Meanwhile, Kono (Grace Park) is dealing with personal issues as she struggles with her suspension from the police force due to an investigation into her past actions. She is frustrated and angry, feeling that she has been unjustly accused of a crime that she did not commit. Kono turns to her cousin, Chin Ho Kelly (Daniel Dae Kim) for help in clearing her name and finding evidence to prove her innocence.

As the investigation into the jewelry store robbery and Coughlin's death continues, McGarrett and his team uncover a conspiracy involving corrupt politicians, wealthy businessmen, and members of the military. They begin to suspect that the theft of the medals was part of a larger scheme involving the sale of American military secrets to foreign governments.

As the investigation heats up, McGarrett and his team find themselves in danger as the people behind the conspiracy try to cover their tracks and eliminate anyone who threatens to expose them. The team must race against time to stop the conspirators before they can sell the military secrets and cripple the United States' national security.

In the end, McGarrett and his team are able to unravel the conspiracy and bring the conspirators to justice. Kono is also able to clear her name and return to the police force, thanks to the evidence uncovered by Chin Ho. The episode ends with McGarrett and his team vowing to protect the people of Hawaii from any threat, foreign or domestic, and to ensure that justice prevails no matter what.

Overall, "Hai'ole" is a thrilling and dramatic episode that sets the tone for the rest of the season. With its complex conspiracy plot, intense action sequences, and emotional character arcs, the episode is a must-watch for fans of the show.