Letters from Britain's first serial killer are going under the hammer at an auction in North Yorkshire.
Known as the 'Black Widow', Mary Ann Cotton was suspected of killing 21 people - including her own children, husbands and lovers.
Cotton penned the letters whilst serving jail time in Durham.
Paul Hughes, from Tennants Auctioneers in Leyburn, believes the letters could go for more then five hundred pounds.
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