In Extremis (CSI: Crime Scene Investigation)

A ruthless and expertly trained contract killer is on assignment in Nevada's remote Desert National Wildlife Range...and he deliberately sets in motion a series of seemingly unconnected events that will soon test the skills of Gil Grissom and his team of CSIs -- Catherine Willows, Nick Stokes, Warrick Brown, Sara Sidle, and Greg Sanders -- to their limit. For all is not as it appears in this federal refuge, as law enforcement and lawbreakers alike are quickly caught up in a growing crime scene that leads to a deadly game of one-upmanship....