The Great Recession has shuffled Clay Jonnon out of his life as a San Francisco web-design drone -- and into a new gig working the night shift at Mr. Penumbra's 24-Hour Bookstore. But Clay learns that this store is even more curious than the name suggests. The few customers come in repeatedly to borrow impossibly obscure volumes, all according to some elaborate arrangement with the gnomic Mr. Penumbra. Soon, Clay has embarked on a complex analysis of the patrons' behavior and roped his friends into helping him figure out just what's going on. But once they bring their findings to Mr. Penumbra, they discover secrets that extend far beyond the walls of the bookstore.
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