Teddy is called away on another case, as Henry is brought in for emergency surgery; Derek and Meredith finally receive news about Zola; a patient experiences complications after surgery.
The team investigate a copycat killer, who is busy recreating the techniques of past infamous murderers.
The NCIS team is suspicious when a Navy lieutenant falls victim to radiation poisoning, and Tony witnesses a gentler side to Ziva.
Two executives at a powerful private equity firm are murdered, leading the agents to suspect the work of a disgruntled investor. Jane thinks the killer may be closer to home.
The CSI unit investigates four fatalities on one wild night in Las Vegas: a nightclub shooting, a stripper found dead in a hotel suite, a man found electrocuted in his bathtub, and a body clad in an alien costume found near Area 51.