The Curious Guide to Things That Aren't features thoughtful riddles - one for each letter of the alphabet - paired with engaging illustrations that reveal and explain the answer. Each spread features a riddle with several clues about an intangible item, such as air, breath, and jokes. Kids then have to figure out the answers through detective work and a little creative reasoning. The clues on each page progress from challenging, more abstract clues to a simple, final clue that encourages the reader to turn the page to discover the answer. The book covers a broad range of themes, from science, language arts, social studies, math, music, and art. The Curious Guide to Things That Aren't teaches creative thinking through deductive reasoning, listening skills, and imagination.