The Liverpool police force had an awful reputation between the wars for corruption, brutality and blundering investigations. Some of the latter can be seen in the Wallace case, where furniture was moved in the murder room to take photos, Wallace's raincoat was removed from under Julia's body before it could be photographed in situ, items weren't fingerprinted etc etc. I think the detectives investigating thought the victim's husband was the man and didn't look any further.
PD James's theory that Wallace impersonated his wife in front of the milk boy with a shawl and a dress on is frankly ridiculous. Wallace was over 6 feet tall, Julia was petite, Wallace also had a thick moustache. Julia spoke to the milk boy, who knew her by sight, urging him to get back home out of the cold. He saw her face.
PD James's theory that Wallace impersonated his wife in front of the milk boy with a shawl and a dress on is frankly ridiculous. Wallace was over 6 feet tall, Julia was petite, Wallace also had a thick moustache. Julia spoke to the milk boy, who knew her by sight, urging him to get back home out of the cold. He saw her face.
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