Robin Sloan

San Francisco, 1969. The summer of drugs, music and a new age dawning. A young, earnest Ajax Penumbra has been given his first assignment as a Junior Acquisitions Officer - to find the single surviving copy of the Techne Tycheon, a mysterious volume that has brought and lost great fortune for anyone who has owned it. After a few weeks of rigorous hunting, Penumbra feels no closer to his goal than when he started. But late one night, after another day of dispiriting dead ends, he stumbles upon a 24-hour bookstore and the possibilities before him expand exponentially. With the help of his friend's homemade computer, an ancient map, a sunken ship and the vast shelves of the 24-hour bookstore, Ajax Penumbra might just find what he's seeking...

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 neighborhood 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.

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.

Dans la librairie de M. Pénombre, où Clay Jannon travaille de nuit, se réunissent les membres d'un club de lecture. Ils lisent de très vieux livres que le nouvel employé n'a pas le droit de toucher. Il désobéit et découvre que les écrits sont codés. Clay et trois de ses amis décident d'enquêter mais M. Pénombre a disparu.--[Memento].