Who took the cookies? Be a math detective along with the kids at Lincoln Elementary in this pick-your-own-path mystery. Be a detective and use your addition, subtraction, and skip counting skills to solve the case. Choose the right answer, and advance to the next clue. Choose the wrong answer, and clear text and visuals explain the math and encourage you, the reader, to try again. Friendly illustrations with a diverse cast of relatable characters will engage readers, while clear math explanations support CCSS standards for second-grade math.