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Interesting, you might be onto something, the series of books looks plausible and somehow not-quite-right.

My local UK library doesn't have any books by that author - https://libraries.hounslow.gov.uk/client/en_GB/hounslow/sear... .

This one in particular seems too implausible - inspiration for Poirot and Downton Abbey? https://www.goodreads.com/book/show/23309690-down-to-the-abb...

I haven't actually read any of the ebooks mind.

[B1FF_PSUVM]

> seems too implausible

Good catch. Also, Christie has been written about for decades and no one ever mentioned this alleged 'forerunner' which is just about a clone ...

Thanks for looking.