NCIS is left horrified when one of their own is murdered while working on a case. Gibbs and the NCIS Major Case Response Team who are equally grief-stricken and devastated take over the handling of the case while attempting to find the killer with a search soon leading them to a woman who the team believe might be linked to the thief who stole from the Navy prior to his death in a car accident. Meanwhile, Abby soon makes a shocking discovery and the team realize that there's more to the woman than meets the eye....