CSI: Crime Scene Investigation is a fast-paced drama about a team of forensic investigators trained to solve crimes by examining the evidence. They are on the case 24/7, scouring the scene, collecting the irrefutable evidence, and finding the missing pieces that will solve the mystery. Catherine Willows, a hard-working single parent with a checkered past and a teenage daughter she's raising on her own, heads the team of investigators at the Crime Lab in Las Vegas following previous leader Gil Grissom's departure.