The city of Ark is the last safe place on Earth. To make sure humans avoid the mistakes of their past and are able to survive, everyone in Ark must speak List, a language of only 500 words. Everyone, that is, except Letta. As apprentice to the Wordsmith, Letta can read all the words that have ever existed. Words like freedom, music, and even pineapple tell her about a world she’s never known.