Mr. Penumbra’s 24 Hour Bookstore (by Robin Sloan)

Loaned by aych and read on a plane, this book got me from SFO to MSP. It's a charming story set in San Francisco and Silicon Valley, about a guy who gets a job at a 24-hour bookstore and realizes there's more to it than meets the eye.

The book doesn't have a ton of depth, and parts of it feel like a setup for satire that never pays off. (For instance, the main female character works at Google and is obsessed with Google in a really unhealthy way, but her obsession is treated with absolute sincerity. Google = God, apparently.)  But the characters and story are charming, and it made for a fun and fast airplane read.