After escaping capture in Miami, serial killer Henry Darius travels to New York with a college student as his hostage in order to steal millions from her family's vault. Upon arriving, Darius kills a group of students in cold blood and leaves clues specifically for Mac of his whereabouts. Meanwhile, while in NY to assist on a case, Horatio is served with a subpoena when the newly appointed DA names him a suspect in an old murder case. David Caruso (CSI: Miami) guest stars in the conclusion of a two-part crossover episode.
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