A college girl is found beheaded and the CSI team discover the T-shirt worn by the victim has hidden messages, which much be decoded if the killings are to stop.
Mac and Stella suspect a popular illusionist of a string of magic-related murders. Meanwhile, Danny goes to Montana to support Lindsay.
The CSIs investigate when a salesman's body is found washed up on Rockaway Beach near several dead sharks.
A muckraking journalist and an unidentified man are found brutally murdered with a bar of gold bullion on the eve of Saint Patrick's Day.