Three Wives, One Husband (2017)

S2E7 Manhattan Manhunt (II)

Horatio Caine travels to New York in pursuit of Henry Darius, determined to fulfill a promise he made to a young boy back in Miami. However, when he and Mac finally track down Darius, they discover that he has vanished once more, this time leaving behind six more victims. This storyline unfolds during the crossover event that begins in CSI: Miami Season 4, Episode 7, titled "Felony Flight (I)."