Skyhill is the most boring castle in all of England, where there has never been even the most haunted ghost. And only Svetlana Zakhorzhevskaya, having arrived to visit a friend who married Lord Skyworth, sees the silhouette of a mysterious woman in blue in the castle window. She alone is able to help the ghost of Lady Margaret find her long-awaited rest, and Lord Peter to get rid of the family curse associated with the ominous ring of the Mother of the gods Anahita.