Set in a rural English hospital during the turmoil of World War II, this classic mystery novel revolves around a series of disturbing events in the hospital's operating theater. When a postman dies on the operating table in what should have been a routine surgery, suspicions arise, leading to an investigation by the charismatic Inspector Cockrill. As the staff's tangled relationships and personal dramas come to light, a second, seemingly accidental death complicates matters further. The inspector must sift through a web of deceit, jealousy, and secrets among the hospital staff to uncover the truth behind the deaths, leading to a tense and unexpected climax.

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