After an accident where the driver was decapitated during a dangerous stunt, the evidence leads the CSIs to believe it was more than an accident. While gathering the evidence, the CSIs find they must go into the world of "sideshows."

After a young woman is found dead shortly after she was auctioned off for charity, the team finds that the woman was trying to uncover the true nature of the event's host. As the team delves deeper into the investigation they soon discover a larger plot that could put Miami in danger.