What are the first names of the three people who are vacationing along California's rocky coast?
A happy vacation along California's rocky coast for a pregnant Mandy Anthony, her husband Dick           (Arthur Franz) and her sister Kate Hazelton is ruined when Mandy has a seizure, loses consciousness and miscarries. Worse, when she awakens, she says that she is "Felicia" and calls Dick "Dickens." A stunned Dick tells an uncomprehending Kate that Felicia was his first wife and Dickens was her pet name for him - and that he's never told Mandy of his first marriage, Dickens or Felicia's death six years earlier!
Felicia demands to visit the Bradleys, an elderly couple whom Dick says that Mandy doesn't know. They're Felicia's parents. She convinces them that she is indeed Felicia, back from the dead. Mrs. Bradley is delighted; Mr. Bradley is horrified. Dick, upset by the reunion, tells Kate that Mrs. Bradley "was a strange, evil woman - Felicia, too" and that he was a fool to not face the truth. Meanwhile, Mr. Bradley says to Mrs. Bradley, "God will punish you for this." Mrs. Bradley contemptuously replies, "You believe in your god. I'll believe in mine."
Dick invites his friends John Mitchell and Molly Prentiss to the vacation house for cocktails. Afterwards, Felicia tries to gas Kate in her bedroom - Kate survives when Mandy's voice awakens her - then goes outside and kills their dog, Copper, who loved Mandy but hates Felicia.
The next day, Kate is at John's house when neighbor Nancy Cordell drops by. She casually tells Kate that she and the Bradleys are members of Maître Renault's (Otto Reichow) devil cult, as was Felicia. Kate expresses an interest and Nancy arranges for Kate to meet Renault.
Mandy Dick Kate