One real-world locked-room mystery that has enthralled and mystified some of the world’s best crime writers from PD James to Raymond Chandler, occurred only a few years before Artemus Oggeltree’s death, in Liverpool, England back in 1931.

It was as Chandler himself described, “the impossible murder because [the main suspect] couldn’t have done it and neither could anyone else...”

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S05 Episode 13 Extra: An Impossible Murder