Burglary seems to be a motive when an appraiser at a Christies-like auction house is killed. However, when the CSI's discover that a cryptic series of dots tattooed on the victim is actually a coded form of the Nazi symbol, they realize the case is connected to neo-Nazis. Mac questions Avi, a Jewish clock repairman who is a camp survivor who was selling his wife's brooch that same day: he admits to arguing with the victim, but given his history, he has long adopted a "turn the other cheek" mentality and walked away. When they search the victim's apartment, they find a secret room filled with second world war contraband, including a diary from a young Jewish woman at Auschwitz. Mac delves further into the history at nearby museum of Judaism, only to discover a story about a woman who gave a German teenager a brooch to secure her safety, only to have the teen take the brooch and turn her in. Mac puts together that the brooch was the same as the one Avi was auctioning and that Avi was the Nazi teen who had disguised himself as a Jew after the war in order to escape suspicion. The victim had discovered Avi's identity and Avi killed him to protect himself. Unfortunately, during the investigation, Danny comes into conflict with a neo-Nazi who ends up suing him for police misconduct.