Meet the little known and even less understood heroes of police work in Las Vegas—the forensic investigators. Led by veteran Gil Grissom, the remarkable team assigned to the Criminalistics Bureau's graveyard shift—including Catherine Willows, Warrick Brown, Nick Stokes, and Sara Sidle—must combine cutting-edge scientific methods and old-fashioned savvy as they work to untangle the evidence behind the yellow police tape. While Nick and Catherine investigate a newly discovered fifteen-year-old murder, Grissom and the rest of the team must uncover the indentity of a cold-blooded killer—one whose execution-style, "double-tap" signature has provoked the interest of FBI agent Rick Culpepper.