Computational thinking has been taught in elementary classrooms in other countries for many years, but in the United States this has only been a focus recently due to the drastic shortage of computer scientists. Early exposure to computational thinking has been shown to motivate students to pursue STEM careers, especially computer science (Jin, Haynie, and Kearns 2016). More engaging approaches that encourage inquiry and creativity when teaching computer science concepts are needed in U.S. elementary classrooms (Jin et al. 2016). In this article the authors present a design challenge focused on teaching third- and fourth-grade students computational thinking skills based on a scenario from a children's book, "Rosie Revere's Big Project Book for Bold Engineers." The nature of this lesson lends itself to be modified for other grade levels or contexts to integrate literacy and computational thinking through authentic engineering design scenarios.