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Mr. Penumbra's 24-Hour Bookstore

A Novel

This book is available for download with iBooks on your Mac or iOS device, and with iTunes on your computer. Books can be read with iBooks on your Mac or iOS device.


A gleeful and exhilarating tale of global conspiracy, complex code-breaking, high-tech data visualization, young love, rollicking adventure, and the secret to eternal life—mostly set in a hole-in-the-wall San Francisco bookstore

The Great Recession has shuffled Clay Jannon out of his life as a San Francisco Web-design drone—and serendipity, sheer curiosity, and the ability to climb a ladder like a monkey has landed him a new gig working the night shift at Mr. Penumbra's 24-Hour Bookstore. But after just a few days on the job, 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 "checking out" 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' behavior 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.

With irresistible brio and dazzling intelligence, Robin Sloan has crafted a literary adventure story for the twenty-first century, evoking both the fairy-tale charm of Haruki Murakami and the enthusiastic novel-of-ideas wizardry of Neal Stephenson or a young Umberto Eco, but with a unique and feisty sensibility that's rare to the world of literary fiction. Mr. Penumbra's 24-Hour Bookstore is exactly what it sounds like: an establishment you have to enter and will never want to leave, a modern-day cabinet of wonders ready to give a jolt of energy to every curious reader, no matter the time of day.

From Publishers Weekly

Aug 06, 2012 – For those who fear that the Internet/e-readers/whatever-form-of-technological-upheaval-is-coming has killed or will kill paper and ink, Sloan’s debut novel will come as good news. A denizen of the tech world and self-described “media inventor” (formerly he was part of the media partnerships team at Twitter), Sloan envisions a San Francisco where piracy and paper are equally useful, and massive data-visualization–processing abilities coexist with so-called “old knowledge.” Really old: as in one of the first typefaces, as in alchemy and the search for immortality. Google has replaced the Medici family as the major patron of art and knowledge, and Clay Jannon, downsized graphic designer and once-and-future nerd now working the night shift for bookstore owner Mr. Penumbra, finds that mysteries and codes are everywhere, not just in the fantasy books and games he loved as a kid. With help from his friends, Clay learns the bookstore’s idiosyncrasies, earns his employer’s trust, and uses media new, old, and old-old to crack a variety of codes. Like all questing heroes, Clay takes on more than he bargained for and learns more than he expected, not least about himself. His story is an old-fashioned tale likably reconceived for the digital age, with the happy message that ingenuity and friendship translate across centuries and data platforms.

Customer Reviews

What a blast!

Very fresh, smart and timely. A must read.

As someone who despairs at the thought of a digital world without tangible books, I appreciated the themes of his novel. (Yet, I read the whole book on my iPhone).

He cleverly juxtaposed old and new in an interwoven story with characters who equally represented the concept of old/new. Ancient books are enjoyed with new technology and a young generation finds ways to enjoy antiquity. The result is fun and positive.

You can never thank an author enough for the experience of a great read, but Thank You, R. Sloan.


If you care about books, technology, mystery, wonder, secret societies, mysticism, immortality, or stories that treat you like a friend instead of an enemy– please read this book.

You'll be better after than you were before.

Very interesting read

This was a cool book, lots of cool techie stuff, and old school stuff too. I liked the codes and cloak & dagger stuff. All in all a good read!

Mr. Penumbra's 24-Hour Bookstore
View in iTunes
  • $9.99
  • Available on iPhone, iPad, iPod touch, and Mac.
  • Category: Literary
  • Published: Oct 02, 2012
  • Publisher: Farrar, Straus and Giroux
  • Seller: Macmillan / Holtzbrinck Publishers, LLC
  • Print Length: 304 Pages
  • Language: English
  • Requirements: To view this book, you must have an iOS device with iBooks 1.3.1 or later and iOS 4.3.3 or later, or a Mac with iBooks 1.0 or later and OS X 10.9 or later.

Customer Ratings