NCIS Norfolk Case Agent Timothy McGee comes across a dissolved corpse at the Norfolk Naval Base, and calls in the Major Case Response Team. As the investigation opens, it becomes apparent that the killer took steps to prevent the body from being identified. Gibbs quickly comes to believe that the motive was identity theft. Tony, Abby, and McGee are tasked with identifying the deceased, while Gibbs and Kate are sent underwater on a submarine to vet the crew and prevent a biological attack.