Catherine must deceive her teammates when she agrees to Keppler's covert and controversial plan to catch the killer of a popular politician.

The leading suspect for the high-profile murder of anti-drug crusading assemblyman Danilo Zamesca is Thomas Simon, the west coast's biggest drug supplier, whose trail quickly grows cold. Catherine agrees to Keppler's unconventional method to find Simon, despite her reservations about lying to her longtime CSI teammates, who soon sense that something is awry.

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