The NCIS team investigate when a Naval officer is found dead in an office in the Pentagon with her murder being recorded via security camera. It appears to be a simple and easy case but then the team later discover that their main suspect has died, having suffered an apparent heart attack, leading them to suspect that someone else is responsible for killing the Naval officer and as this goes on, Agent Barrett's team continue investigating the Port to Port serial killings, culminating in a shocking revelation being revealed, one that leaves all the NCIS personnel stunned.