When a severed leg is discovered in the Everglades belonging to a girl who went missing from Las Vegas a week earlier, Horatio Caine (David Caruso) sends for Dr. Ray Langston (Laurence Fishburne).This launches a crossover that begins on "CSI: Miami," moves to "CSI: NY" and finishes up in Las Vegas on "CSI: Crime Scene Investigation," making it the first time a "CSI" crossover has involved all three shows in the franchise.

"Everyone stays true to their writing style," "CSI: NY" exec producer Pam Veasey tells ET. "What you fundamentally do is tell a 'CSI' story, which is what we all have in common. Once it gets to your show, you will see each of the show's take a different approach to a story that starts in Miami. We did all get together and talk about what the through-line would be. Obviously, Ray Langston travels through all of the shows. You have to find the consistencies with his character, how he would flow into each story."

Following Miami, Langston rushes to New York when Mac Taylor (Gary Sinise) and his team identify a woman hidden in a big rig as someone Langston interviewed in Miami. Then the woman disappears and Taylor and Langston realize that they have uncovered an interstate trucking ring specializing in human cargo and black-market organ harvesting.

"The story is really a ticking clock story," adds "CSI: NY" executive producer Peter Lenkov. "It is really a hunt for a suspect, but also saving a girl's life. I think we put blinders on to get that done by the end of the episode. This [case] takes priority because it is real triage the way it lands in our lap. We realize soon after that time is of the essence. We elected in that episode to make it our sole focus."

The search finally takes Langston back to Las Vegas, where the investigation leads to a prostitution ring that may be harboring the missing woman.

"They are all great episodes that blend together and lead you to the next," Pam concludes.

The "CSI" crossover begins on "CSI: Miami" on Monday, Nov. 9 at 10 p.m., moves to "CSI: NY" Wednesday, Nov. 11 at 10 p.m., and wraps up on "CSI: Crime Scene Investigation" Thursday, Nov. 12 at 9 p.m. all on CBS.