The investigators attend the gala grand opening of a mob museum, only to witness an attempted hit on mob lawyer and former mayor Oscar Goodman.

The CSI crew is stumped when they discover a disembodied brain at a crime scene where all the other brains are accounted for.

Three new murders related to three unsolved (or incorrectly solved) crimes from the past come back to haunt the CSIs.

When a woman is found dead and her hair is done up '70s style complete with vintage clothes, the CSI team discovers clues that point to a killer with a hair fetish.

Season finale: The investigation of a triple homicide leads to the discovery of corruption running rampant throughout the LVPD. The closer they get to the truth, the more serious are the repercussions. To be continued...