A serial killer taunts the CSIs by leaving them cryptic hints, and the longer it takes them to decode these puzzles, the higher the death toll rises .





When Horatio’s ex-girlfriend is killed in an explosion, the team looks within their own department to find the killer.





When a suburban soccer mom is murdered, the CSIs uncover her family’s dark past, while Delko continues his undercover mission.





Evidence is stolen from the lab following a diamond heist and Eric Delko returns.





A victim’s spirit won’t leave Calleigh alone until she finds justice for his murder.





Spring Break raises the body count in Miami when the CSI team splits up to solve three different murders.





When Horatio’s son Kyle returns from war, he seeks his father’s help to solve a murder.





The CSIs unravel a workplace murder mystery when a hated receptionist is murdered.





Horatio and Delko must travel to Los Angeles when a secret from Jesse’s past may allow a killer to go free.





The CSIs solve the murder of a man who was killed in outer space.