Anyone can learn computer science, even at the elementary school level. This book delves into the essential computer science concept of debugging using age-appropriate language and colorful illustrations. A meaningful storyline is paired with an accessible curricular topic to engage and excite readers. This book introduces readers to a relatable character and familiar situation, which demonstrates how debugging is used in everyday life. Readers will follow Li as he goes back to search for his lost mitten. This fiction title is paired with the nonfiction title Where Is My Umbrella? (ISBN: 978153835052). The instructional guide on the inside front and back covers provides: Vocabulary, Background knowledge, Text-dependent questions, Whole class activities, and Independent activities.