Clay Jannon has landed 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 the store is even more curious than the name suggests. He concludes it must be a front for something larger, and soon he’s embarked on a complex analysis of the customers’ behavior. It turns out the secrets extend far outside the walls of the bookstore.