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

Written by:
Anthony E. Zuiker, Ann Donahue, Elizabeth Devine

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Directed By:
Rob Bailey

Anna Belknap as Lindsay Monroe
Carmine Giovinazzo as Danny Messer
Eddie Cahill as Det. Don Flack
Gary Sinise as Mac Taylor
Hill Harper as Dr. Sheldon Hawkes
Melina Kanakaredes as Stella Bonasera

Alan Marco as Subpoena Server
Alicia Coppola as Carmen Cavallo
Andrew St. John as Dalton
Brian Lloyd as Window Washer
Carlos Leon as Vince Rossetti
Evan Parke as Albert Grafton/Big Al
James Badge Dale as Henry Darius
John Dalesandro as Maitre'D
Kandis Erickson as Paige
Kat Dennings as Sarah Endecott
Lisa Canning as Lydia Johnson
Michael Gross as Tom Endecott
Peyton List as Alexa Endecott
Rick Hoffman as Dr. Miles Feldstein
Robert Joy as Dr. Sid Hammerback
Robyn Lively as Secretary
Samantha Lockwood as Samantha