When an aspiring dancer is murdered backstage during Cirque du Soleil's KA show, the CSIs investigate what goes on behind-the-scenes to uncover the truth.

The CSIs investigate first-hand the behind-the-scenes action of Cirque du Soleil in order to determine what may have contributed to the young dancer's untimely death. Meanwhile, after Catherine and Nick visit a nightclub where John Mayer is performing, Catherine finds herself in jeopardy and must act as her own CSI in order to determine who may be targeting her and her family. Also, Grissom is perplexed after receiving an uncanny miniature replica of the crime scene he is investigating.

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