During cleanup work, Mabel Clarence discovers human bones in the walls of the manor house Higher Barton. The old rumor that a young woman is said to haunt the place flares up again. However, the deceased is a man who died ten years ago and whose body was hidden in the manor. Abigail, the former owner, must come as a witness and eventually comes under the investigators' scrutiny. When a 16th-century gold treasure is found, Mabel suspects a connection. But is this the right lead? Mabel's detective instincts are called upon once more. When she finally uncovers the truth, she finds herself in deadly danger.