When a high school girl's body washes up on the beach, Patrick Jane sets a mentalist trap in order to get her surfing friends to turn on each other and reveal what really happened.
In autopsy, Ducky makes a startling discovery that leads to the search for a missing child. Meanwhile, Tony struggles to deal with his feelings for Jeanne.
The CSI team investigates a murder with ties to two teenaged kidnapped girls. Lisa Rinna guest stars as Tori Nolan, the wife of the director of the San Diego Crime Lab.
In the fourth season finale, a hostage situation erupts in the Philadelphia police department. The team must negotiate quickly before they lose one of their own.
A murder investigation leads the team to stolen missiles and a dangerous militia group.
