CSI: NY S02 E07 Manhattan Manhunt (II)

"How long does it take to get hooked on the latest CSI: hit? About a New York minute."

Horatio Caine follows Henry Darius to New York so that he can keep his promise to a young boy in Miami, but by the time he and Mac are able to locate Darius he has disappeared again, leaving behind six more bodies. The crossover starts on CSI: Miami S04E07 Felony Flight (I).