After finding various body parts scattered around the city, the CSIs discover they belong to a tough, but successful wrestling coach at a prestigious NYC High School. The case takes a dramatic turn when Mac and his team mine the coach's computer and discover he emailed a provocative photo of a twelve-year old boy to students on his wrestling team. However, further investigation reveals that a pair of pranksters on the team pirated the coach's Wi-Fi signal and sent the pictures from his email account in an attempt to get him fired. Unbeknownst to them, the father of one of the recipients intercepted his son's email and took matters into his own hands. Also, Flack is dragged under a cloud of suspecion when a suspect he brings in for questioning inexplicably dies in the interrogation room.