Fortune Favours the Dead

When wealthy young widow Abigail Collins is murdered and the police are making no progress, New York's most successful private detective Lillian Pentecost and her assisant Willowjean Parker are hired by the family to track down the culprit. On Halloween night at a costume party at the Collins' mansion, a fortune teller performed a séance which greatly disturbed Abigail. Several hours later her body was discovered bludgeoned to death in her late husband's office. Problem is, the door to the office was locked from the inside. There was no-one else in the room, and the murder weapon was beside the victim; the fortune teller's crystal ball. It looks like an impossible crime, but Pentecost and Parker know there is no such thing.