When her young daughter plunged over the cliff to her death, Joyce Mills had a breakdown and was sent to a mental institution. Now, as she walked again through the dark passages of Mills Castle, built upon a high rock, a series of terrifying occurences lay in wait for her. Her scarf was found tightly tied around a strangled cat's neck... a woman's gruesomely bloody face appeared in her mirror as she watched in horror... and the phantom ghost of long-dead Captain Peter Mills, who built thhe huge castle - and then killed himself in it - threatened her fragile sanity...indeed, her very life!