The Sea House — Margaret Summerton

A bleak, isolated seaside, a suspicious drowning, a crumbling old mansion and its potpourri of strange guests -- all of these were waiting to greet young Charlotte Elliott when she rang the ancient bell on her grandmother's door.

Behind the drawn blinds of the old house someone -- or something -- stirred. Then the door opened, and Charlotte was plunged into an eerie nightmare which did not end with the coming of day.