The culprit? A state-of-the-art drone.
WATCH: Preview Of Criminal Minds' "Killer App" (Episode 4, Season 13)
Upon arriving in Silicon Valley, the mecca of machine learning, the team races to locate the killer controlling the deadly device.
STREAM: Full Episodes Of Criminal Minds On CBS All Access
Can the BAU find the murderer behind the unmanned machine?
Watch all-new episodes of Criminal Minds on Wednesdays at 10/9c on CBS and CBS All Access.