Dr. Sarah Chapel returns to the small town of Brighton Mills when her father Dr. Robert Chapel unexpectedly dies. His clients and friends miss him, and Sarah discloses that all of them have perfect health; they hear voices when they are sleeping; and they are addicted to the stimulant Tributol. Her further investigation discloses a dark secret about the haunting voices.

Ce synopsis est en anglais : nous ne l'avons pas encore traduit.