SHORTLISTED FOR THE 2014 DEBUT CATEGORY - KITCHIES PRIZE LONGLISTED FOR THE 2013 IMPAC DUBLIN LITERARY AWARDS A New York Times bestseller, Mr Penumbra's 24-hour Bookstore is an entirely charming and lovable first novel of mysterious books and dusty bookshops; it is a witty and delightful love-letter to both the old book world and the new. Recession has shuffled Clay Jannon out of his life as a Web-design drone and serendipity coupled with sheer curiosity has landed him a new job working the night shift at Mr. Penumbra's 24-Hour Bookstore. And it doesn't take long for Clay to realize that the quiet, dusty book emporium is even more curious than the name suggests. There are only a few fanatically committed customers, but they never seem to actually buy anything, instead they simply borrow impossibly obscure volumes perched on dangerously high shelves, all according to some elaborate arrangement with the eccentric proprietor. The store must be a front for something larger, Clay concludes, and soon he has plugged in his laptop, roped in his friends (and a cute girl who works for Google) and embarked on a high-tech analysis of the customers' behaviour. What they discover is an ancient secret that can only be solved by modern means, and a global-conspiracy guarded by Mr. Penumbra himself... who has mysteriously disappeared.

It's like Fight Club meets The Great British Bake Off - NPR Lois Clary is a software engineer. She codes all day and collapses at night into her sofa, her human contact limited to the two brothers who run the local takeaway from which she orders dinner every evening - that is, until the brothers are forced out of business. But they have one last delivery for Lois: their culture, the sourdough starter used to bake their famous bread. She must keep it alive, feed it daily, play it music, and learn to bake with it. Lois is no baker, but soon, not only is she eating her own homemade, but she's initiated into a fantastical and possibly fantastically sinister underground world: a secret market that aims to fuse home-cooked food with cutting-edge technology...

Leavened by the same infectious intelligence and lovable nerdiness that made Robin Sloan's Mr Penumbra's 24-Hour Bookstore such a sensation, Sourdough marks the triumphant return of a unique and beloved young writer. Lois Clary is a software engineer at General Dexterity, a San Francisco robotics company with world-changing ambitions. She codes all day and collapses at night, her human contact limited to the two brothers who run the neighbourhood hole-in-the-wall from which she orders dinner every evening. Then, disaster! Visa issues. The brothers close up shop, and fast. But they have one last delivery for Lois: their culture, the sourdough starter used to bake their bread. She must keep it alive, they tell her - feed it daily, play it music, and learn to bake with it. Lois is no baker, but she could use a roommate, even if it is a needy colony of microorganisms. Soon, not only is she eating her own homemade bread, she's providing loaves daily to the General Dexterity cafeteria. The company chef urges her to take her product to the farmer's market, and a whole new world opens up. When Lois comes before the jury that decides who sells what at Bay Area markets, she encounters a close-knit club with no appetite for new members. But then, an alternative emerges: a secret market that aims to fuse food and technology. But who are these people, exactly? Sourdough is a soup of skilfully balanced ingredients: there's satire, a touch of fantasy, a pinch of SF, all bound up with a likeable narrator whose zest for life is infectious. The novel opens a door on a world that's both comforting and thrillingly odd. - The Guardian

A New York Times bestseller, Mr Penumbra's 24-hour Bookstore is an entirely charming and lovable first novel of mysterious books and dusty bookshops; it is a witty and delightful love-letter to both the old book world and the new.

Recession has shuffled Clay Jannon out of his life as a San Francisco Web-design drone, and serendipity, coupled with sheer curiosity, has landed him a new job working the night shift at Mr. Penumbra's 24-Hour Bookstore. But after just a few days, Clay begins to realize that this store is even more curious than the name suggests. There are only a few customers, but they come in repeatedly and never seem to actually buy anything, instead they simply borrow impossibly obscure volumes from strange corners of the store, all according to some elaborate, long-standing arrangement with the gnomic Mr. Penumbra.

The store must be a front for something larger, Clay concludes, and soon he's embarked on a complex analysis of the customers' behaviour and roped his friends into helping to figure out just what's going on.

But once they bring their findings to Mr. Penumbra, it turns out the secrets extend far outside the walls of the bookstore...

A Winner of the Alex Award, a finalist for the "Los Angeles Times" Book Prize for First Fiction, named a Best Book of the Year by NPR, "Los Angeles Times," and "San Francisco Chronicle
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The Great Recession has shuffled Clay Jannon away from life as a San Francisco web-design drone and into the aisles of Mr. Penumbra's 24-Hour Bookstore. But after a few days on the job, Clay discovers that the store is more curious than either its name or its gnomic owner might suggest. The customers are few, and they never seem to buy anything--instead, they "check out" large, obscure volumes from strange corners of the store. Suspicious, Clay engineers an analysis of the clientele's behavior, seeking help from his variously talented friends. But when they bring their findings to Mr. Penumbra, they discover the bookstore's secrets extend far beyond its walls. Rendered with irresistible brio and dazzling intelligence, Robin Sloan's "Mr. Penumbra's 24-Hour Bookstore" is exactly what it sounds like: an establishment you have to enter and will never want to leave.