Kate Farrant, chairperson of a medical charity, rings for an ambulance, having been overcome by a severe gastrointestinal disorder during the night in the basement apartment of her gambling club. When she dies in the hospital 10 days later, the forensic pathologist discovers that she has been poisoned. There are several people who have reason both to fear and hate the young woman, and the investigation leads from the club to those who worked at the charity before Kate took it over and the school where she and her psychopathic brother were pupils 10 years earlier. Only then can light be shed upon the murderer and the mystery solved.