Csi Las Vegas 4x1 May 2026

The first episode of Season 4 is titled " Assume Nothing " (the first part of a two-episode arc). It follows Grissom and his team as they investigate a series of ritualistic, staged murders involving a suspected "swinging" couple.

The evidence led them to a local nightclub, a place where the wealthy came to shed their identities. Sara Sidle tracked a specific type of rare, industrial-strength lubricant found at the scene back to a boutique supplier. The trail was getting warm, but the killers were already one step ahead, selecting their next "guest" for a deadly encounter. CSI Las Vegas 4x1

Back at the lab, Grissom peered through his microscope at a microscopic shard of glass found in the victim's hair. It wasn't from a window or a bottle; it was a fragment of a high-end camera lens. The killers weren't just murderers—they were voyeurs, filming their "art" for a private audience. The first episode of Season 4 is titled

"Assume nothing," Grissom whispered to himself, a mantra he lived by. Sara Sidle tracked a specific type of rare,