When the Codebreakers Club’s beloved professor goes missing, it’s time to get to the bottom of this puzzling problem. Chris, Kaira, and Ren soon discover some very intriguing notes written in the professor’s distinctive handwriting. The catch? The Codebreakers must solve puzzles he’s left behind to get the next clue! Key features include: More than 150 logic puzzles, including crosswords, logic grids, rebuses, word searches, cypher codes, and more for kids 9–12 , engaging topics such as history, science, geography, and pop culture, and fun, fast-paced mystery with hints and tips from characters while honing critical-thinking skills and logical-reasoning aptitude.