When her teenage sister, Kimmi, is brutally murdered with her boyfriend at a school dance by a jealous classmate, Jennifer Carter suspects there is more to the crime than initially meets the eye. As she begins to dig deeper, she uncovers a wide-spread mystery involving an enigmatic ringtone being distributed like a computer virus over social media. The deeper she descends into the mystery of the haunting motif, the more she becomes entangled in its dangerous web.