A mother identifies her son as the attacker in a brutal assault that left her seriously injured and her husband dead. But later she recants her positive identification, and another unrelated person confesses to the crime.
The team tries to find out who is responsible for a jewel heist at the home of a powerful defense attorney. However, they soon discover that everybody who comes in contact with the jewels is turning up dead.
A married couple is led to believe that they have found their badly decomposed dead son in a car on the roof of a Wall Street building. However, further investigation reveals that the victim is one of the boy's college classmates.
As the CSIs investigate a case involving a woman who appears to have been scared to death in a supposedly haunted section of Central Park, Mac stumbles on another dead body buried nearby in the same part of the park.
After the woman who assumed Chief of Detectives Carver's deceased sister's identity turns up dead, and the evidence continues to mount, Mac begins to suspect that Carver may have been responsible for both murders.
After a man dressed in a clown costume kills a bakery owner, the evidence is soon connected to a man from Flack's past who reluctantly agreed to join witness protection to testify against drug dealers.
An exclusive party in the back of an 18-wheeler ends in death when the driver sends the vehicle into the Hudson River, and the team tries to figure out what happened. However, a mobster whose daughter was killed may beat CSI to the killer.