Catherine and Brass find a man trapped in cement near a murder victim at a construction site. However, after being rescued and ruled a suspect, the man refuses to reveal his identity. Meanwhile, Nick, Warrick and Sofia investigate the death of an old woman found in her apartment with her head in an oven, but discover that she didn't die from inhaling gas. Grissom, Sara and Greg investigate a murder at a chicken processing plant which, after another miniature model of the crime scene in discovered, aids them in solving the previously unsolved murders.