The show opens with a clown putting on make-up, walking down a NY street, and up to a brownstone. A man opens the door and greets the clown, whereupon, the clown pulls out a gun and shoots him. The trail is lost, however, because the clown had posted an ad on Craig’s list, inviting people to come to the location of the murder, dressed like a clown to win a prize, in order to mask his escape. Our CSIs follow the evidence and find the shooter, it turns out he was in witness protection in Kansas; he was an innocent witness to a crime and had to leave his entire life, including his pregnant girlfriend behind. Someone had ordered a hit on him and he managed to capture the hired gun, torture him to find out the name of the man who hired him. He then heads to New York, killing the man who took out a contract on his life. He was an innocent man who gave up his life to “do the right thing” only to be a target anyway which made him want to take back his life. It’s somewhat of a personal case for Flack, since he was the detective who persuaded our suspect to testify and go into WitSec. In the end, Flack gives the suspect a chance to visit with the son he never met, before Flack takes him to jail.
The FBI gets involved in the case and we have our first encounter with Jo’s ex-husband, who happens to be the agent assigned to the investigation.