The CSI team investigates a series of brutal tourist beatings that take place within the span of a few hours throughout the Las Vegas area.

When an innocent man is brutally attacked and beaten to death by what looks like a monster in a black cape, the CSIs are called to investigate -- only to learn that a similar attack took place moments later. As the crime spree continues, the team follows the trail of evidence until Greg interrupts a beating in action and must make a difficult decision that could impact his life forever.

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