A group of teenagers gather at a golf course at a specified time. After the flash mob disperses, a body is found near the site. The CSIs follow the mob to a very prestigious prep school. They manage to trace the origin of the text messages telling the receivers to meet at the golf course to the son of one of Florida's most famous defense attorneys. At the same time, Horatio and Yelina are working to find the killer of a woman found in a dumpster.