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A Rare Book of Cunning Device is a short audiobook free on Audible that is a part of the ever expanding universe around PC Peter Grant and his 'Falcon' adventures. I like how the series is spread across all different ways of reading (besides the main books and some short stories, the graphic novels - for me at least - have become an integral part of the series).
It's too short, but way too good to miss if you're into the series. It focuses on The British Library, which is a wonderful place by the way if you've never visited it.
