To Kill a Witch — Alice Brennan

Laurie Brooks visited Gull Island twice to interview the world-famous author Agatha Gray. Agatha was an expert on witchcraft-and the people of the area hated and feared her, accusing the old woman of dealing with Satan himself. Agatha had buried herself in the study of the dark powers for so long it seemed that the island had been transformed into a corner of Hell. Then Laurie was astonished to find that Agatha had named her as heir to Gull Island, with the proviso that Laurie must spend three months in the house. At first the girl welcomed the unusual break in her life, but very soon she began to understand the reason for her native fears: Death walked the rocky beaches of Gull Island, and seemed to be reaching out for Laurie herself. Would she be the next to die...the next to be damned forever?"