he team is investigating a murder which was committed by someone dressed up like a clown. They start by checking out who the clown is and when they do. They go there and find the man tied up, he says someone came knocked him out and took his clown suit. They find a fingerprint and when they run in, it reveals to be that of a man who did misdemeanor. They learn that the man just vanished five years ago. That's when Jo thinks the man entered the witness protection program and sure enough a Fed arrives, her ex. He tells Mac that the man is not a killer. But Mac stands by the evidence. Mac learns that Flack was the one who got the man into the program. So Mac talks to Flack who only reiterates what the Fed said that the man is not a killer. So Flack tries to find him while Mac tries to figure out why he killed the person he did.

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