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An internet service provider (ISP) in or near Washington, DC, goes down, and a gunfight breaks out at the ISP facility, then electric power goes down in a cascade manner throughout the entire metro area; a woman Navy lieutenant dies, so Gibbs and company investigate, using old-fashioned methods. The victim was a proud third-generation member of the Navy. Abby provides a lead to a car, which leads to an ocean shipping container, which yields clues; Abby also makes a manual hard-copy fingerprint match, which leads to two more bodies and another string of surprises. With the help of another woman Naval officer, the gang fit the pieces together and grab the real bad guy behind everything, then the juice comes back on, and life goes on.