Sara Arnot's babysitter is murdered in a seemingly random attack in London's Hyde Park. A few days later another young woman is muredered in a village in Berkshire and crime reporter Joe Crozier follows a trail from London to Edinburgh and the Himalayan foothills of India in his search for a serial killer. Sara's husband, a doctor who leads a double life, becomes prime suspect, while Oliver Maslin a psychologist with a radical theory on memory, searches for the killer in Sara's unconscious mind. Nothing is what it seems in this story of murder, the boundaries of mental endurance and a secret from the past going back to the last days of the British Raj in India, a secret one woman in Sara's family is determined must stay buried.