Avsnitt 1

Members of a girls’ competitive dance team are stricken with a strange, psychophysiological illness that manifests itself in violent fits and spasms and then begins spreading in the community through technology. Neurologist Logan Harlen returns to her hometown to investigate the cause . Fighting her own demons and the growing manipulation of a brother on death row, Logan develops an uneasy suspicion that the hysteria surrounding the girls might actually be linked to social media and her own tragic past.