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A new mystery featuring Detective Constable Sally Bithron The death of a police informant leads to the task least loved by any law enforcement officer ? that of investigating your superiors. Sally Bithron is assigned to support Assistant Chief Constable Esther Davidson in the enquiry. And when a senior policeman apparently commits suicide, Sally and Esther have to ask some uncomfortable questions ? and find that they are prevented from doing so by the powers that be.