A bookstore is the perfect place to hide the truth. On dusty far shelves, Mr. Penumbra keeps books that, if you believe Google, do not exist. A line of strange symbols, gold-stamped bindings, rare readers, and the night shop clerk—an eccentric owner makes it clear without words: don’t ask questions, and above all—don’t read… But the web of mysteries is already tightening around the hero. A couple of careless phrases, and suddenly there’s a whole battalion of friends: bookish people and Google programmers, connoisseurs of antiquity and fans of “Star Wars”—trying to crack the cipher from 500 years ago.