When residents of New York City cannot reach the police when calling 911, the Cyber team realizes this is an airborne computer virus that is infecting cell phones and must find the hacker responsible. Also, D.B. meets a woman after responding to a mistaken text sent by her.

When a jogger's body is found, the Cyber team use the fitness tracker she was wearing at the time of the murder to retrace her steps for the entire night leading up to her death.