A dead body is found in the remains of a collapsed porch at a high school party, and the team discovers that she was strangled before the accident. Meanwhile, a serial rapist from one of Jo's past cases strikes in New York City.
When news of a high school house party goes viral, resulting in overcrowding, a collapsed porch and a teenage girl's death, the CSIs must use social media to uncover the truth about how she died. Meanwhile, Jo's final case at the FBI returns to haunt her.—CBS Publicity