Oh no! Lucky, the class pet, has escaped! Where did he go? Be a math detective along with the kids at Lincoln Elementary in this pick-your-own-path mystery. Use math and measurement skills to figure out where Lucky could be hiding. Things keep going missing at Lincoln Elementary. And the student detectives there love solving mysteries! Can you help find the missing class pet? 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.