Plot

When the CSI team investigates three seemingly unrelated murders, they discover someone is getting revenge for cold case murders that were never solved.

Nightclub owner Kevin Fetzer was fatally slashed at his grand birthday party, and the corpse humiliatingly exposed like an eight year-old with his pants down. His worthless father, who rowed with him at the party, has a solid alibi. As a knave, he was the non-prosecuted last suspect in a somewhat similar case. A Latino gang's ex-leader was neck-laced, yet his successor Diego Barra is genuinely surprised. Darlene Crocker killed herself due to an overdose with the same PCP that killed her daughter twenty years ago. the cases aren't linked, except by popular, terminally sick former LVPD detective Stan Richardson and his drinking buddies.—KGF Vissers

During his birthday party, the successful Kevin Fetzer is found beaten and murdered with his pants down on his giant birthday cake. The lead suspect is his estranged father but the man has an alibi. Then Catherine finds a cold case connected to Kevin. Meanwhile, Nick and Sara investigate the case of a man burned alive into a stack of tires. He is identified as the gang member Ramon Castillo, aka Espectro, and Det. Vega and Nick interrogate his enemy Diego Barra in prison. He whispers the name Martha and finds that Diego's girlfriend Martha Arterro was murdered by Ramon in the same modus operandi. Meanwhile, a woman named Darlene Crocker is found violently murdered in a motel room and Greg and Morgan investigate the crime scene. The autopsy indicates PCP in her system and the CSI find a connection with another old case. Who is the vigilante that is bringing justice to the system?—Claudio Carvalho, Rio de Janeiro, Brazil