How odd, Anne Beddingfeld thought, that a stranger caught her eye, recoiled in horror, and fell to his death on the rails of the Hyde Park Underground Station. Odder still was a doctor in a brown suit who pronounced him dead and vanished into the crowd. But what really aroused Anne's suspicion was when she learned of the doctor's link to the murder of a famous ballerina, a fortune in diamonds, and a drug-lord embroiled in blackmail. Most frightening of all was the attempt made on Anne's own life. Still, Anne is unable to resist the lure of an isolated mansion that could hold the solution to the bizarre mystery.