An ex-Navy SEAL is suspected of murdering his wife. Claiming his innocence, he takes hostages aboard the U.S.S. Missouri in Pearl Harbor and gives authorities four hours to find the real killer. McGarrett chooses to sneak aboard the Missouri alone while the rest of the Five-0 team try to piece together what actually happened at the crime scene. McGarrett's plan is assisted by a retired sailor, who had previously served with McGarrett's grandfather on the U.S.S. Arizona at the time of the attack on Pearl Harbor.