A member of a Champ Car pit crew is engulfed in invisible flames and dies during a qualifying race at the Grand Prix Americas.

A young woman is attacked by a shark and later dies, but it is discovered that she was shot first. The case becomes even more difficult for the CSIs when one of their coworkers becomes a leading suspect. The dead woman worked for a private-investigation agency that specializes in luring and entrapping married men suspected of infidelity.