The fingerprints of a presumed dead petty officer, Ned Quinn, turn up at the scene of a double homicide. Claiming innocence, Quinn explains he was in the garage working for the victims when they were murdered. While fighting with metro police who want Quinn prosecuted immediately, the team discovers evidence linking a security guard to an emptied safe at the crime scene. Having been exposed, the guard shoots McGee with a taser and unsuccessfully tries to escape. Quinn, explaining that he went "undercover" after his apartment burnt down believing his wife and daughter would be better off with the service benefits from his presumed death, is convinced by Gibbs to rejoin his family for Christmas.