When the CSIs are alerted to the murder of a man dressed as Santa Claus, they determine the victim was stabbed to death during a company holiday party that took place at his boss Ryan Bonham's house. They uncover video footage from the party showing two different men dressed as Santa and determine that the killer targeted the wrong Santa. The CSIs identify the mystery Santa as Jayson Walt, the man who rented out the reindeer and snow for Ryan's party. After learning that Jayson's incarcerated older brother Gary was depending on him for a kidney transplant, the team recalls that the killer twisted the knife to ensure his kidneys would be destroyed. They look into victims Gary allegedly organized hits on and discover Ryan's wife was one of them. The compliance processor at the loan company Gary used to launder his money at was about to go to the police to report him before Gary killed him along with Ryan's wife who was working there at the time. Ryan knew about the kidney transplant and hired Jayson for the opportunity to kill Gary by proxy, but accidentally mistook his employee for Jayson instead. The team arrives at Ryan's house to find him missing and they put the pieces together to learn that Jayson took him to a warehouse to torture him for the location of the bank records incriminating he and his brother in money laundering. Ryan made up the existence of the records to buy him some time, but the team arrives on the scene to arrest both men for their crimes.