When one of their own is killed, the CSIs must figure out why the murder scene is a detailed recreation of an unsolved case from 1957. Also, Mac and Christine continue to grow closer.
Mac Taylor is leaving the lab when he receives a photo on his phone. The photo reminds him of a cold case from 1957 so he goes to the research lab where he finds a crime scene photo almost identical as the photo he received on his phone, including the location and the posing of the victim. When he arrives at the scene he learns the victim is someone employed at the lab as a technician.—Charles Caro