Mr. Penumbra's 24-Hour Bookstore, written by Robin Sloan, and narrated by Ari Fliakos, is an enjoyable mystery novel set in San Francisco during the late 2000s that brings new and old technology to explore the secrets of a unique bookstore and its patrons.Published by Macmillan Audio.

Mr. Penumbra's 24-Hour Bookstore

Ajax Penumbra 1969

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