Lorac, the pen name of the British writer Edith Caroline Rivett.

[1][2] It is the thirty sixth in her long-running series featuring Chief Inspector MacDonald of Scotland Yard, one of the more conventional detectives of the Golden Age of Detective Fiction.

When Rodney Bretton, a lecturer in mathematics, is knocked down and killed by a lorry is it assumed to be a tragic accident.

However the drowning of his daughter Wendy in her bath a couple of months later leads MacDonald to launch an investigation.

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