In 1939, a new radio network, WBN, is preparing to go on the air in the United States. Even before the debut, Penny Henderson has to cope with a disgruntled sponsor, a demanding boss, and an impending divorce from her ex-husband. A mysterious voice interrupts the broadcast, and members of the cast begin to die as the show begins. Her husband Roger is on the case as the cops pursue him through WBN's halls.