After receiving a call from her friend Helen Corning, Nancy agrees to help solve a baffling mystery.
Could the house be haunted? Just as soon as she hangs up the phone, a strange man visits Nancy\'s house to warn her and her father that they are in danger because of a case h.
They have heard music, thumps, and creaking noises at night, and seen eerie shadows on the walls.
Helen\'s Aunt Rosemary has been living with her mother at the old family mansion, and they have noticed many strange things.
After receiving a call from her friend Helen Corning, Nancy agrees to help solve a baffling mystery