A world-famous poker champion drops dead in the middle of a game. He appears to have had a heart attack. Outside of the city, Nick and Catherine investigate the death of a young street racer.

A strong and tall man follows another man in the casino to the parking lot. Soon the CSI team comes to the casino to investigate the murder of the man, Tony Sciarra, who was brutally beaten. They watch the tape of the surveillance cameras and see a shorter man stealing Tony's chips and being followed by him. When they identify the killer, Walter Darian, they arrest him; however, the guy attacks Grissom first in the interrogation room and then the guards that try to subdue him. Out of the blue, Walter is dead. Now, they investigate his belongings since he was an accumulator and find evidence that may lead them to another murder case.