Turn math class into an investigation! Students solve short mystery “case files” where every clue is a math problem (geometry, ratios, fractions, perimeter/area), unlocking suspects and a final code. Perfect for stations, bell ringers, sub plans, or a Friday challenge. What’s included: Teacher Overview, 2 printable Case Files, Suspect List, Student Evidence Log, optional Lock Sheet, full Answer Keys, quick 12-point Rubric, implementation tips, extensions & variations. Estimated 25–40 minutes p