hen a couple is killed when someone sets fire to their house and traps them, the team investigates. When McGarrett arrives, he sees that no one is inside the house investigating. He learns that an ATF agent has taken charge. She says that who set the fire, has set fires on both Hawaii and California but this would be the first time someone was killed. Which means he's escalating. Steve learns the agent is officially not on the case because the arsonist killed her husband. Danny decides to take his girlfriend, Amber on a week end getaway and decides to be incommunicado. Kona meets a guy who is looking for his wife who is Amber. So he tells Steve who checks the guy out.

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