After Charlie's license is suspended, Jake becomes his driver; Alan plans to go to Chelsea's birthday party.
Jake graduates and must decide what to do with his life.
When a nuclear powered Russian satellite is knocked out of orbit, the new Director of Homeland Security reunites the team; Paige and Walter confront their feelings.
Sydney is scared as she thinks that Dixon may have heard her talking to the CIA.
After all the guests attending an upscale fundraising soiree for the science department at a local university fall ill, the CSI team gears up to investigate; Catherine enlists Grace's roommate to help her find clues after Grace disappears.