For the keyword "cd key csi fatal conspiracy," Google returns a minefield of malware-ridden "keygens" (key generators). Here is the truth:

YOU FOUND THE KEY. NOW THEY FIND YOU.

. One box was ripped open, its contents scattered. On the desk, a single CD key— F4T4L-C0N5P-1R4CY-X999 —was written in what appeared to be Thorne’s own blood. The Forensic Evidence

Lena’s coffee cup stopped halfway to her lips.

Do not let a dead CD key stop you from enjoying one of the last great traditional adventure games. The truth is out there, and often, the truth is a simple No-CD patch. Preserve your game, ignore the keygen scams, and get back to dusting for fingerprints.