When a young woman is found dead in an abandoned area, Catherine investigates the crime scene. Soon Grissom's CSI replacement Mike Keppler, from Baltimore, arrives to help her to look for evidences, but is careless and touches the victim's hair. They do not find any belongings or ID of the victim. They proceed the investigation and using her fingerprints in the missing people database, the identify her as Veronica Sorenson. Keppler believes the killer has done it before and using Veronica's characteristics in the database, they find three cold cases from 1975, 1989 and 1999. Now Catherine, Keppler, Sara and Nick revisit the cases to see if the old evidences may be used in their state-of-art equipment and provide new leads.
—Claudio Carvalho, Rio de Janeiro, Brazil