S4, E2: When a rich family is trapped on a burning yacht in shark-infested waters, the CSIs must investigate. The daughter is killed during the tragedy, and the team soon discovers a web of lies within the family. Now, as the team delves into the world of outrageously wealthy yacht club members, they find that not everyone is who they appear to be. Meanwhile, Calleigh clashes with her replacement in the ballistics lab.