Csi | Las Vegas 4x1

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.

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. CSI Las Vegas 4x1

"They aren't hiding," Grissom realized, looking at the photos of the suspects caught on a grainy ATM camera nearby. "They're performing." The first episode of Season 4 is titled